Gallstones
Solid deposits, primarily of cholesterol or bilirubin, that form within the gallbladder and can obstruct biliary flow, causing biliary colic, cholecystitis, or other complications.
Cholelithiasis literally means "chole" (bile) + "lith" (stone) + "iasis" (condition) — the formation of stones within the gallbladder.
Choledocholithiasis adds "choledocho-" (common bile duct) — stones within the common bile duct (CBD). The vast majority of CBD stones are secondary, meaning they form in the gallbladder and then migrate through the cystic duct into the CBD. Primary CBD stones (forming de novo within the duct) are uncommon in Western populations but notably more common in Asia, particularly in the context of Recurrent Pyogenic Cholangitis (RPC) [1][2].
The clinical importance of gallstones lies in their spectrum of presentation:
- ~80% are asymptomatic — discovered incidentally on imaging [2].
- ~3% of asymptomatic patients become symptomatic per year [1].
- ~2/3 of asymptomatic patients remain symptom-free over 20 years [1].
- Once symptomatic, patients tend to have recurrent bouts of biliary colic.
- < 5% of symptomatic patients develop complications per year [1].
The complications of gallstones — acute cholecystitis, choledocholithiasis, acute cholangitis, gallstone pancreatitis, Mirizzi syndrome, gallstone ileus, and gallbladder carcinoma — form a huge chunk of hepatobiliary surgery and are extremely high-yield for exams.
Courvoisier's Law
In painless obstructive jaundice with a palpable (enlarged) gallbladder, the cause is unlikely to be gallstones. Why? A gallbladder that has harboured stones undergoes repeated episodes of cholecystitis → fibrosis → contracted, non-distensible wall. So when a CBD obstruction occurs (e.g., from a stone), the gallbladder cannot distend. A palpable gallbladder in this setting therefore suggests a non-stone cause (e.g., periampullary tumour — pancreatic head cancer, cholangiocarcinoma, ampullary carcinoma) [2].
Exceptions to Courvoisier's Law: (i) Double impaction — stone simultaneously in cystic duct and distal CBD; (ii) Mirizzi syndrome; (iii) RPC [2].
Saint's Triad = Gallstones + Hiatal hernia + Colonic diverticulosis (three common conditions co-existing in obese, Western-diet patients — not causally linked but frequently seen together) [2].
| Factor | Detail |
|---|---|
| Prevalence | 10–15% of adults in developed countries; lower in Africa/Asia but rising with westernization of diet |
| Sex | Female:Male ≈ 3:1 (oestrogen effect) |
| Age | Increases with age; peak incidence in 40s–60s |
| Geography (HK-relevant) | Cholesterol stones predominate overall, but brown pigment stones are relatively more common in Hong Kong/SE Asia due to higher prevalence of biliary parasites and RPC [1][2] |
| Asymptomatic | ~80% remain asymptomatic [2] |
| Complications | < 5% of symptomatic patients/year develop complications [1] |
3. Risk Factors
| Category | Risk Factor | Mechanism |
|---|---|---|
| Demographics | Female sex | Oestrogen ↑ hepatic HMG-CoA reductase → ↑ cholesterol secretion into bile; also ↓ bile salt secretion |
| Age > 40 ("Forty") | Cumulative cholesterol supersaturation over time | |
| Pregnancy ("Fertile") | Progesterone ↓ gallbladder motility → stasis; oestrogen ↑ cholesterol secretion | |
| Obesity ("Fat") | ↑ Cholesterol synthesis and biliary secretion | |
| Family history | 1st degree relative → 2× risk; genetic polymorphisms in cholesterol transporters (ABCG5/G8) | |
| Medical | Rapid weight loss / bariatric surgery | Mobilisation of body cholesterol + gallbladder stasis from low caloric intake |
| Diabetes mellitus | Autonomic neuropathy → impaired GB emptying; ↑ cholesterol saturation of bile | |
| Liver cirrhosis | Impaired bile salt synthesis → ↑ cholesterol-to-bile-salt ratio | |
| Crohn's disease / ileal resection | Loss of terminal ileum → ↓ bile salt reabsorption → ↓ bile salt pool → supersaturation | |
| TPN / prolonged fasting | No CCK stimulus → gallbladder stasis ("JCCK" — no food, no CCK) [2] | |
| Drugs | OCP / HRT (oestrogen) | Same mechanism as pregnancy |
| Fibrates | ↑ Biliary cholesterol secretion | |
| Octreotide | ↓ GB motility |
| Type | Risk Factor | Mechanism |
|---|---|---|
| Black pigment | Chronic haemolysis (thalassaemia, hereditary spherocytosis, sickle cell disease, G6PD deficiency) | ↑ Unconjugated bilirubin production → supersaturation of calcium bilirubinate in bile |
| Chronic liver disease / cirrhosis | Impaired conjugation of bilirubin | |
| Brown pigment | Biliary infection / parasites (E. coli, Klebsiella, Clonorchis sinensis, Ascaris lumbricoides) | Bacterial β-glucuronidase deconjugates bilirubin glucuronide → unconjugated bilirubin precipitates with calcium → calcium bilirubinate stones [1][2] |
| Biliary stasis / strictures / RPC | Stasis predisposes to bacterial colonisation and stone formation | |
| Low-protein diet (historically in SE Asia) | Relative enzyme deficiency → ↑ deconjugation of bilirubin [2] |
Hong Kong Context
Brown pigment stones and RPC ("Hong Kong disease") are disproportionately important in the local exam setting. These stones form de novo within the intrahepatic ducts (not the gallbladder), driven by parasitic/bacterial infection → β-glucuronidase → unconjugated bilirubin → calcium bilirubinate precipitation. The left intrahepatic ducts are preferentially affected [2].
4. Anatomy & Function of the Biliary System
Understanding biliary anatomy is essential to understanding where stones get stuck and what symptoms they cause.
The gallbladder is a pear-shaped, muscular sac sitting on the undersurface of the liver (segments IVB and V).
| Part | Description | Clinical Significance |
|---|---|---|
| Fundus | Blind-ended tip, projects beyond the liver edge at the tip of the 9th costal cartilage (intersection with lateral border of rectus abdominis) | Palpable when distended; site of Murphy's sign localisation |
| Body | Main storage area | Concentrates bile 5–10× by active absorption of water and electrolytes |
| Infundibulum (Hartmann's pouch) | Outpouching at the junction of body and neck | Most common site of gallstone impaction → biliary colic, Mirizzi syndrome [1][2] |
| Neck | Narrow, S-shaped, continuous with cystic duct | Transition zone to cystic duct |
- Contains the spiral valves of Heister — mucosal folds that resist distension and regulate bile flow (not true valves).
- Joins the common hepatic duct (CHD) to form the common bile duct (CBD).
- Normal CBD diameter: ≤ 6 mm (add 1 mm per decade over 60; post-cholecystectomy up to 10 mm is acceptable) [3].
| Border | Structure |
|---|---|
| Medial | Common hepatic duct |
| Inferior | Cystic duct |
| Superior | Inferior surface of the liver (segment V) |
Contents: Cystic artery (branch of right hepatic artery), cystic lymph node (node of Lund/Calot), connective tissue, sometimes an accessory hepatic duct.
Critical View of Safety (CVS)
During laparoscopic cholecystectomy, the surgeon must achieve the Critical View of Safety before clipping any structure: (1) Calot's triangle is cleared of fat and fibrous tissue; (2) The lower third of the gallbladder is separated from the liver bed; (3) Only two structures should be seen entering the gallbladder (cystic duct and cystic artery). This prevents misidentification and inadvertent CBD injury — the most feared complication of cholecystectomy.
- Muscular sphincter at the ampulla of Vater controlling flow of bile and pancreatic juice into the duodenum.
- Acts as a mechanical barrier to ascending duodenal infection — disruption (e.g., post-sphincterotomy, stent placement) predisposes to cholangitis [1].
- Hepatocytes secrete ~600 mL of bile/day.
- Between meals, the sphincter of Oddi is closed → bile diverted into the gallbladder via the cystic duct.
- Gallbladder concentrates bile by absorbing water and electrolytes (up to 10-fold).
- After a meal (especially fatty), duodenal I-cells release cholecystokinin (CCK) → gallbladder contracts + sphincter of Oddi relaxes → bile flows into the duodenum.
- Bile salts emulsify fats for absorption; they are reabsorbed in the terminal ileum and recycled to the liver via the portal vein (enterohepatic circulation).
Why does a fatty meal trigger biliary colic? Fat in the duodenum → CCK release → gallbladder contraction against an obstructed cystic duct (stone in Hartmann's pouch/cystic duct) → ↑ intraluminal pressure → visceral pain.
5. Pathophysiology of Gallstone Formation
The formation of cholesterol stones requires three key defects (the "lithogenic triad"):
- Supersaturation: Cholesterol is insoluble in water. It is kept in solution by bile salts and phospholipids forming mixed micelles. When cholesterol secretion exceeds the solubilising capacity → supersaturated ("lithogenic") bile → cholesterol crystals precipitate.
- Nucleation: Pronucleating factors (mucin glycoproteins secreted by gallbladder epithelium, calcium salts, prostaglandins) accelerate crystal aggregation. Antinucleating factors (apolipoprotein A-I, A-II) inhibit it. The balance determines whether crystals form.
- Gallbladder stasis: Impaired gallbladder emptying allows crystals to remain and grow rather than being flushed into the duodenum.
5.2 Pigment Stone Formation
- Formed within the gallbladder.
- Composed of calcium bilirubinate + calcium carbonate + calcium phosphate polymerized into a hard, jet-black stone.
- Pathophysiology: ↑ unconjugated bilirubin in bile (from chronic haemolysis or impaired hepatic conjugation) → supersaturation → precipitation with calcium.
- Radiopaque (due to calcium content) — unlike cholesterol stones.
- Formed within the bile ducts (intrahepatic or CBD) — this is the key distinction.
- Composed of calcium bilirubinate + bacterial cell bodies + fatty acid soaps.
- Pathophysiology: bacterial infection (E. coli, Klebsiella) → bacterial β-glucuronidase hydrolyses conjugated bilirubin glucuronide → unconjugated bilirubin + glucuronic acid → unconjugated bilirubin precipitates with calcium [1][2].
- Parasitic infection (Clonorchis sinensis, Ascaris lumbricoides) causes epithelial damage → bacterial translocation → same cascade [2].
- Radiopaque but softer and more friable than black stones.
6. Classification of Gallstones
| Feature | Cholesterol Stones | Black Pigment Stones | Brown Pigment Stones |
|---|---|---|---|
| Frequency | ~85% (Western) | ~10% | ~5% (but higher in Asia) |
| Composition | > 70% cholesterol by weight | Calcium bilirubinate polymers | Calcium bilirubinate + bacterial debris |
| Location of formation | Gallbladder | Gallbladder | Bile ducts (intra/extrahepatic) |
| Radiolucency | Radiolucent (< 10% radiopaque) | Radiopaque | Radiopaque (soft) |
| Colour | Yellow-green, greasy | Jet black, hard | Earthy brown, soft, friable |
| Associated conditions | Obesity, oestrogen, Western diet | Chronic haemolysis, cirrhosis | Biliary infection/parasites, RPC |
| Sterile vs infected | Sterile | Sterile | Infected |
| Multiplicity | Often multiple, faceted | Multiple, small | Few, large, soft |
| Location | Term | Key Clinical Consequence |
|---|---|---|
| Gallbladder | Cholelithiasis | Biliary colic, acute/chronic cholecystitis |
| Cystic duct | Cholelithiasis | Biliary colic, acute cholecystitis, Mirizzi syndrome |
| CBD | Choledocholithiasis | Obstructive jaundice, cholangitis, gallstone pancreatitis |
| Intrahepatic ducts | Hepatolithiasis | RPC, cholangiocarcinoma |
| Ampulla of Vater | Choledocholithiasis | Gallstone pancreatitis, cholangitis |
This is the roadmap. Gallstones can present in many ways depending on where the stone lodges and what it obstructs [2]:
8. Clinical Features
Mechanism: Gallbladder contracts (usually post-prandially, triggered by CCK) against a stone transiently impacted in Hartmann's pouch or the cystic duct → ↑ intraluminal pressure → visceral pain via splanchnic afferents [1][2].
| Feature | Detail | Pathophysiological Basis |
|---|---|---|
| Site | RUQ / epigastric / substernal | Visceral afferents from the gallbladder travel with splanchnic nerves to T7–T9 → referred to the epigastrium/RUQ |
| Onset | Abrupt | Sudden impaction of stone |
| Character | Steady, intense, dull, constant — NOT truly colicky (the name is misleading!) | The gallbladder and cystic duct lack peristalsis, so there are no rhythmic waves of pain — it is a sustained contraction against a fixed obstruction [2] |
| Radiation | Right shoulder / right scapula / interscapular | Referred pain via the phrenic nerve (C3–C5) from diaphragmatic peritoneal irritation, or via splanchnic afferents to T7–T9 dermatomes |
| Duration | ≥ 30 min, plateaus within 1 hour, subsides < 6 hours | If > 6 hours → suspect acute cholecystitis [1][2] |
| Timing | After a fatty meal; can wake patient from sleep | Fatty meal → CCK → gallbladder contraction |
| Associated | Sweating, nausea, vomiting | Vagal stimulation from visceral pain |
| NOT exacerbated by | Movement | It is visceral pain, not parietal peritoneal — no somatic component |
| NOT relieved by | Squatting, bowel movements, passage of flatus | Distinguishes from colonic/rectal pathology |
| Between attacks | Patient feels completely well | Transient obstruction self-resolves → stone falls back into GB |
Key distinction: Biliary colic is episodic — discrete attacks with completely well intervals. If pain becomes continuous > 6 hours with fever and localised tenderness → think acute cholecystitis [1][2].
Exam Trap: 'Biliary Colic' is NOT Colicky
Despite its name, biliary colic is a steady, constant pain — not the waxing-and-waning "colicky" pain seen in ureteric or intestinal colic. This is because the gallbladder and cystic duct have no peristalsis — so the pain is from sustained distension against a fixed obstruction, not from rhythmic muscular contractions [2].
Investigations for Biliary Colic:
- USG gallbladder: Gold standard — hyperechoic stone with posterior acoustic shadowing, gravity-dependent (rolling stone sign when patient turns lateral) [2][3].
- AXR: Only ~15% of gallstones are radiopaque (pigment stones). May see Mercedes-Benz sign (gas in fissures of stone) — low sensitivity.
- Bloods: CBC, LFT (should be normal in uncomplicated biliary colic — if cholestatic pattern, think choledocholithiasis), amylase/lipase (rule out pancreatitis) [2].
8.3 Acute Cholecystitis
Definition: Acute inflammation of the gallbladder [3].
Pathology: Obstruction of cystic duct → complication of gallstone disease → chemical inflammation → bacterial infection [3].
Mechanism: Prolonged gallstone impaction at Hartmann's pouch / cystic duct → stagnant bile → gallbladder distension (mucocele/hydrops) → concentrated bile salts cause chemical inflammation (first 48 hours) → secondary bacterial infection (E. coli, Klebsiella, Strep faecalis) [2][3].
Symptoms:
| Symptom | Detail | Pathophysiological Basis |
|---|---|---|
| Pain | Starts as biliary colic but more constant, longer > 6 hours | Persistent obstruction → ongoing distension + inflammation → transition from visceral to parietal peritoneal pain |
| Fever + chills | Low-grade initially, may spike with secondary infection | Chemical then bacterial inflammation → systemic inflammatory response |
| Nausea / vomiting | Common | Vagal stimulation, ileus from peritoneal inflammation |
Signs:
| Sign | Detail | Pathophysiological Basis |
|---|---|---|
| Murphy's sign | Inspiratory arrest during deep palpation of RUQ — the inflamed gallbladder descends with inspiration and contacts the examiner's hand, causing pain and reflex inspiratory arrest | Parietal peritoneal inflammation overlying the inflamed gallbladder fundus |
| RUQ tenderness with guarding | Localised peritonism | Inflammation extending to parietal peritoneum |
| Low-grade fever | 37.5–38.5°C typically | Inflammatory cytokines |
| Tachycardia | In proportion to fever / pain | Sympathetic response |
USG findings — 5 cardinal signs of acute cholecystitis [2]:
- Presence of gallstones
- Distended GB ( > 4 × 10 cm)
- GB wall thickening > 3 mm
- Pericholecystic fluid / stranding (from wall oedema)
- Sonographic Murphy sign (maximal tenderness when USG probe pressed directly over the GB)
If USG is inconclusive:
- HIDA scan (hepatobiliary iminodiacetic acid): Non-visualisation of the gallbladder (because radiotracer cannot enter through the obstructed cystic duct) = positive for acute cholecystitis. Sensitivity ~95%.
- MRCP with morphine augmentation: Morphine ↑ sphincter of Oddi pressure → forces bile into the gallbladder; non-filling confirms cystic duct obstruction [2].
Mechanism: Microvascular occlusion within the gallbladder wall → ischaemia → inflammation and infection, NOT associated with gallstones [1][2].
- Classically occurs in critically ill / hospitalised patients: ICU patients, those on TPN, extensive burns, sepsis, major operations, multiple trauma, prolonged illness with multi-organ dysfunction [1][2].
- Risk factors: Dehydration, shock (systemic hypoperfusion), TPN (no CCK stimulation → stasis) [2].
- Clinical presentation is similar to calculous cholecystitis (fever, RUQ pain, leucocytosis) but with higher mortality [2].
- Management: Laparoscopic cholecystectomy or gallbladder drainage (percutaneous cholecystostomy) if unfit for surgery [1][2].
| Complication | Mechanism | Clinical Features |
|---|---|---|
| Gallbladder empyema | Persistent cystic duct obstruction + purulent bacterial infection → pus fills the gallbladder | Tender RUQ mass + septic-looking patient, high swinging fever [2] |
| Gangrenous cholecystitis (20%) | Continued distension → ↓ mural blood flow → ischaemic necrosis of gallbladder wall | Worsening sepsis, may paradoxically have decreased pain (nerve necrosis) |
| Perforation → biliary peritonitis | Necrotic GB wall ruptures (less common as usually wrapped by omentum) | Generalized peritonitis, haemodynamic instability |
| Emphysematous cholecystitis | Secondary infection with gas-forming organisms (e.g., Clostridium welchii/perfringens) | Insidious onset, abdominal crepitus; gas in GB wall on imaging [2] |
| Cholecystoenteric fistula + gallstone ileus | Chronic inflammation → GB wall erodes into adjacent bowel (usually duodenum) → stone passes into bowel → mechanical SBO | See gallstone ileus section below |
Mechanism: Recurrent acute cholecystitis or persistent mechanical irritation by gallstones → chronic inflammatory infiltrate → fibrosis and thickening of GB wall [1][2].
Symptoms:
- Repeated attacks of biliary colic with well intervals.
- Vague dyspepsia, fat intolerance, bloating (less specific).
Signs:
- Often minimal between attacks.
- Contracted, thick-walled gallbladder on USG.
Complications:
- CA gallbladder — chronic inflammation → dysplasia → carcinoma sequence [2].
- Porcelain gallbladder: Calcification of GB wall due to extensive scarring. Carries 2–3% risk of malignancy → absolute indication for cholecystectomy even if asymptomatic [1][2].
- Typhoid carrier state: Gallbladder infected by Salmonella typhi → chronic carriage in bile [2].
USG findings: Contracted gallbladder with wall thickening and gallstones [2].
Mechanism: Gallstones migrate from the gallbladder through the cystic duct into the CBD → obstruction of bile flow → upstream biliary dilatation.
Symptoms [1]:
| Symptom | Detail | Pathophysiological Basis |
|---|---|---|
| Jaundice | Most common manifestation — yellowish discolouration of skin/sclera | Obstructed bile flow → conjugated bilirubin refluxes into blood → deposited in tissues |
| Transient jaundice if stone temporarily impacts ampulla then moves | "Ball-valve" effect at the ampulla | |
| Progressive jaundice if stone completely impacts | Complete CBD obstruction | |
| RUQ / epigastric pain | More prolonged > 6 hours than typical biliary colic | Stone in CBD causes sustained obstruction; resolves when stone passes or is removed |
| Dark urine ("coca-cola urine") | Conjugated bilirubin (water-soluble) filtered by kidneys | |
| Pale/clay-coloured stools | No bilirubin reaching the gut → no stercobilinogen | |
| Pruritus | Bile salt deposition in skin | |
| Nausea / vomiting | Vagal stimulation |
Signs:
- Jaundice (scleral icterus first — albumin in sclera has high affinity for bilirubin).
- RUQ tenderness (variable).
- Cholestatic LFT pattern: ↑ ALP, ↑ GGT, ↑ conjugated bilirubin; AST/ALT may be mildly elevated.
- Dilated CBD on USG ( > 6 mm, or > 10 mm post-cholecystectomy).
Mechanism: Biliary obstruction + stasis → bacterial infection of the biliary tract [1][2]. Obstruction alone causes obstructive jaundice; bacteria alone without obstruction are usually cleared. It is the combination that produces cholangitis [1].
Normal biliary defences (all of which must be overwhelmed) [1]:
- Continuous flushing action of bile flow
- Bacteriostatic activity of bile salts
- Biliary mucous + secretory IgA (anti-adherence factors)
- Sphincter of Oddi — mechanical barrier to ascending duodenal bacteria
- Gram-negative rods: E. coli (most common), Klebsiella pneumoniae, Enterobacter sp., Pseudomonas (especially if stent in situ)
- Gram-positive: Enterococcus sp.
- Anaerobes: Bacteroides fragilis
Clinical Features:
| Feature | Pathophysiological Basis |
|---|---|
| Charcot's triad (present in 50–70%) [2]: Fever + RUQ pain + Jaundice | Infection → fever; obstruction → jaundice and upstream pressure → pain |
| Reynolds' pentad ( < 10%) [2]: Charcot's triad + Hypotension + Altered mental status | Biliary sepsis → septic shock → end-organ hypoperfusion including cerebral |
Charcot's Triad vs Reynolds' Pentad
Charcot's triad = the classic triad of acute cholangitis (Fever + Jaundice + RUQ pain). Present in only ~50–70% of cases.
Reynolds' pentad = Charcot's triad + hypotension + altered mental status → indicates suppurative cholangitis with septic shock — a life-threatening emergency requiring urgent biliary decompression. Present in < 10% of cases [1][2].
Mechanism: Gallstone migrates to the ampulla of Vater → transient or persistent obstruction → reflux of bile into the pancreatic duct → premature activation of pancreatic enzymes (trypsinogen → trypsin) → autodigestion of pancreatic parenchyma [1][4].
Gallstones are the most common cause of acute pancreatitis (55%) [4].
| Feature | Detail | Pathophysiological Basis |
|---|---|---|
| Epigastric pain | Severe, constant, radiating to the back, improves with leaning forward | Pancreas is retroperitoneal → pain referred to the back; leaning forward reduces stretch on retroperitoneal structures |
| Nausea / vomiting | Prominent | Inflammation + ileus |
| Fever | Due to chemical inflammation (not necessarily infection) | SIRS response from cytokine release |
| Cullen's sign | Periumbilical bruising | Retroperitoneal haemorrhage tracking along the falciform ligament to the umbilicus [2] |
| Grey Turner's sign | Flank bruising | Retroperitoneal haemorrhage tracking to the flanks [2] |
| Fox's sign | Inguinal ligament bruising | Retroperitoneal haemorrhage tracking inferiorly |
| Tetany | Transient hypocalcaemia | Fat saponification: lipase → fat necrosis → release of fatty acids → precipitate with calcium → ↓ serum calcium [2] |
Mechanism: Common hepatic duct (CHD) obstruction caused by extrinsic compression from a stone impacted in Hartmann's pouch or the cystic duct [1][2].
| Feature | Detail |
|---|---|
| Presentation | Fever, jaundice, RUQ pain — may mimic cholangitis or cholecystitis |
| Key sign | Jaundice with palpable gallbladder — an exception to Courvoisier's Law [2] |
| Chronic inflammation | May erode into the bile duct wall → cholecystobiliary fistula (cholecystohepatic or cholecystocholedochal) [1][2] |
| Association | CA gallbladder — recurrent inflammation + biliary stasis [1][2] |
Csendes Classification [1][2]:
| Type | Description |
|---|---|
| I | External compression of CHD, no fistula |
| II | Fistula involving < 1/3 of CBD circumference |
| III | Fistula involving 1/3–2/3 of CBD circumference |
| IV | Fistula involving > 2/3 of CBD circumference (complete destruction) |
| V | Any type + cholecystoenteric fistula (5A: no gallstone ileus; 5B: with gallstone ileus) [2] |
Mechanism: Chronic cholecystitis → gallstone erodes through the GB wall into adjacent bowel through a cholecystoenteric fistula (most commonly cholecystoduodenal) → large stone ( > 2.5 cm) passes through the bowel → impacts at the narrowest point of the small bowel (terminal ileum, ~2 feet proximal to the ileocaecal valve) → mechanical small bowel obstruction [2].
Bouveret's Syndrome: A variant where the stone impacts in the duodenum or stomach, causing gastric outlet obstruction (GOO) [2].
Clinical Features: Features of distal small bowel obstruction — colicky abdominal pain, vomiting (may be faeculent), abdominal distension, absolute constipation.
Investigations:
- AXR: Rigler's triad [2]:
- Pneumobilia (air in biliary tree — through the cholecystoenteric fistula)
- Small bowel obstruction
- Ectopic gallstone (usually in RIF, at ileocaecal valve)
- CT abdomen: Gallbladder wall thickening + Rigler's triad — much more sensitive than AXR.
Other causes of pneumobilia (DDx on AXR): Emphysematous cholecystitis, post-ERCP, post-cholecystectomy, blunt abdominal trauma, sphincter of Oddi incompetence [2].
Covered briefly here as a complication of chronic gallstone disease:
- 95% of patients with gallbladder carcinoma have gallstones — one of the strongest risk factors [1].
- Risk factors ("4P") [2]: Polyps ( > 1 cm), Porcelain gallbladder, Primary sclerosing cholangitis, Pancreatobiliary duct anomalous junction (a/w choledochal cyst).
- Female predominance (M:F = 1:2–3) [1].
- Very poor prognosis: most discovered late and unresectable at diagnosis — 5-year OS < 5% [2].
- Spreads via direct invasion (liver segments IV and V), lymphatics (cystic duct node → pericholedochal → hilar → coeliac/SMA nodes), and haematogenous (lung, peritoneum) [1].
Also called "Hong Kong disease" / Oriental cholangiohepatitis [1][2].
Mechanism: Parasitic infestation (e.g., Clonorchis sinensis from raw freshwater fish) → biliary epithelial damage → bacterial translocation → stricture formation → biliary stasis → bacterial β-glucuronidase → deconjugation of bilirubin → brown pigment stone formation de novo within intrahepatic ducts → cycle of obstruction, infection, and further stone formation [1][2].
| Feature | Detail |
|---|---|
| Age/Sex | Middle-aged, equal M:F |
| Location | Usually starts in left intrahepatic ducts [2] |
| Stone type | Brown pigment (calcium bilirubinate) — NOT cholesterol |
| Clinical | Recurrent episodes of acute cholangitis (Charcot's triad) — 1–2 episodes/year [2] |
| Complications | Biliary sepsis, liver abscess, pancreatitis, cirrhosis (chronic biliary obstruction), cholangiocarcinoma [2] |
| Biliary Colic | Acute Cholecystitis | Choledocholithiasis | Acute Cholangitis | |
|---|---|---|---|---|
| Mechanism | Stone transiently stuck at Hartmann's pouch / cystic duct | Inflammation of GB due to gallstone / biliary sludge | Migration of gallstones into CBD | Bacterial infection secondary to CBD obstruction |
| Pain | RUQ, < 6h | RUQ, > 6h | RUQ, > 6h | RUQ |
| Fever | No | Yes | ± | Yes (with rigors) |
| Jaundice | No | Usually No | Yes | Yes |
| Murphy's sign | No | Yes | No | No |
| Labs | Normal | ↑ WBC, CRP | Cholestatic LFT (↑ALP, ↑GGT, ↑bilirubin) | ↑ WBC, CRP + cholestatic LFT |
| Imaging | USG: stone + shadow | USG: 5 cardinal signs | USG: dilated CBD + stone | USG: dilated CBD + stone |
| Management | Elective LC | Resuscitation, IV antibiotics, LC | Supportive, biliary decompression, LC | Resuscitation, IV antibiotics, biliary decompression, LC |
High Yield Summary
- Gallstones are classified by composition: Cholesterol (85%, radiolucent), Black pigment (haemolysis, radiopaque), Brown pigment (infection/parasites, radiopaque, form in ducts).
- 5Fs: Fat, Female, Forty, Fertile, Family — risk factors for cholesterol stones.
- 80% of gallstones are asymptomatic; 3%/year become symptomatic.
- Biliary colic = steady (NOT colicky) RUQ pain < 6h after fatty meal, no fever, no jaundice, self-resolving.
- Acute cholecystitis = pain > 6h + fever + Murphy's sign; 5 USG cardinal signs (gallstones, distended GB, wall thickening > 3mm, pericholecystic fluid, sonographic Murphy's sign).
- Choledocholithiasis = obstructive jaundice + cholestatic LFT + dilated CBD on USG.
- Charcot's triad (Fever + Jaundice + RUQ pain) = acute cholangitis; Reynolds' pentad adds hypotension + AMS = suppurative cholangitis / septic shock.
- Gallstone pancreatitis = most common cause of acute pancreatitis (55%); epigastric pain radiating to back.
- Courvoisier's Law: Painless jaundice + palpable GB = unlikely gallstones (think periampullary tumour).
- Mirizzi syndrome: CHD obstruction by stone in Hartmann's pouch; Csendes classification (Types I–V).
- Gallstone ileus: Rigler's triad = pneumobilia + SBO + ectopic gallstone.
- RPC ("Hong Kong disease"): Brown pigment stones forming de novo in intrahepatic ducts (usually left); parasites → β-glucuronidase → unconjugated bilirubin → calcium bilirubinate stones.
- Porcelain gallbladder = absolute indication for cholecystectomy (risk of GB carcinoma).
Active Recall - Gallstones
[1] Senior notes: felixlai.md (Gastrointestinal Diseases — Cholelithiasis, Choledocholithiasis, Acute Cholangitis, Mirizzi Syndrome, Gallbladder Cancer, Acute Pancreatitis, RPC sections) [2] Senior notes: maxim.md (Gallstone Diseases, Biliary Colic, Acute Cholecystitis, Mirizzi Syndrome, Gallstone Ileus, RPC, Acute Cholangitis, Acute Pancreatitis, GB Carcinoma sections) [3] Lecture slides: GC 200. RUQ pain, jaundice and fever Cholecytitis and cholangitis Imaging of GI system.pdf [4] Lecture slides: Acute pancreatitis.pdf
Differential Diagnosis of Gallstones
The differential diagnosis of gallstones must be approached systematically because gallstones themselves present in many different ways — and at each presentation (RUQ pain, jaundice, cholangitis, pancreatitis), there is a different differential list. The key clinical skill is to determine (1) is this gallstone-related or not? and (2) if gallstone-related, which specific gallstone complication is it?
Think of the differential as concentric circles: first, distinguish among the various gallstone presentations themselves (biliary colic vs. cholecystitis vs. choledocholithiasis vs. cholangitis vs. pancreatitis), and second, distinguish gallstone disease from non-gallstone conditions that mimic it.
Before considering non-gallstone diagnoses, you must first differentiate within the gallstone spectrum, because the management is radically different:
The key differentiating features among gallstone presentations themselves were covered in detail in the Clinical Features section. The summary table below is useful for rapid ward-round differentiation [1][2]:
| Feature | Biliary Colic | Acute Cholecystitis | Choledocholithiasis | Acute Cholangitis | Gallstone Pancreatitis |
|---|---|---|---|---|---|
| Pain duration | < 6h | > 6h | > 6h | Variable | Hours–days |
| Fever | No | Yes | ± | Yes (with rigors) | Yes (chemical) |
| Jaundice | No | Usually No | Yes | Yes | ± |
| Murphy's sign | No | Yes | No | No | No |
| Labs | Normal | ↑WBC, CRP | Cholestatic LFT | ↑WBC + cholestatic LFT | ↑ Amylase/lipase ≥ 3× ULN |
| Key imaging | USG: stone + shadow | USG: 5 cardinal signs | USG: dilated CBD | USG: dilated CBD | CT (if severe) |
2. Differential Diagnosis by Presenting Complaint
The DDx changes depending on how the patient walks in. Let's go through each major presentation.
This is the most common exam scenario: a patient with RUQ pain after a fatty meal. The differential is broad because many structures occupy or refer pain to the RUQ.
| Category | Condition | How to Differentiate from Gallstones |
|---|---|---|
| Biliary | Gallbladder polyps (adenoma, cholesterolosis, adenomyomatosis) | USG: polyps are not gravity-dependent and have no posterior acoustic shadow (unlike stones which are gravity-dependent with shadowing) [1][2][5] |
| Sphincter of Oddi dysfunction | Pain < 6h, intermittent; normal laboratory and radiological tests; diagnosed by manometry [1] | |
| Functional gallbladder disorder | Pain < 6h, intermittent; normal laboratory and radiological tests; diagnosed by HIDA with CCK-stimulated ejection fraction < 35% [1] | |
| Hepatic | Acute hepatitis (viral, alcoholic, drug-induced) | Markedly ↑ AST/ALT (hepatocellular pattern, NOT cholestatic); history of viral exposure, alcohol, drugs; USG: no stones, may show hepatomegaly |
| Liver abscess (pyogenic or amoebic) | Swinging fever, tender hepatomegaly; USG/CT: hypoechoic/hypodense lesion in liver parenchyma; travel history (amoebic) [1] | |
| Hepatocellular carcinoma | Chronic liver disease background; AFP elevated; CT: arterial enhancement with portal venous washout | |
| Gastroduodenal | Peptic ulcer disease (gastric/duodenal ulcer) | Epigastric burning, meal-related (DU relieved by food, GU worsened); OGD diagnostic; perforation → pneumoperitoneum on erect CXR [1] |
| Pancreatic | Acute pancreatitis | Epigastric pain radiating to the back, improves leaning forward; ↑ amylase/lipase ≥ 3× ULN; gallstones may be the cause (gallstone pancreatitis is both a complication of gallstones AND a differential for RUQ pain) [1] |
| Intestinal | Acute appendicitis (retrocaecal/high appendix) | Pain typically starts periumbilical then migrates to RIF; McBurney's point tenderness; CT: inflamed appendix with periappendiceal fat stranding [1] |
| Pulmonary/Cardiac | Right lower lobe pneumonia | Cough, sputum, pleuritic chest pain referred to RUQ; CXR: consolidation in RLL [1] |
| Pleurisy | Pleuritic pain, friction rub; CXR may show effusion | |
| Myocardial infarction (inferior MI) | Epigastric pain, diaphoresis, nausea; ECG: ST changes in II, III, aVF; troponin elevated [1] | |
| Renal | Right renal colic | Loin-to-groin pain, haematuria; CT KUB: ureteric stone; differentiated from gallstone on lateral AXR view (renal stone is posterior, gallstone is anterior) [2] |
| Musculoskeletal | Costochondritis / intercostal pathology | Reproducible with palpation of chest wall; no peritoneal signs |
The Dangerous Mimics
Two conditions that mimic biliary colic but carry life-threatening consequences if missed:
- Inferior myocardial infarction — can present as pure epigastric/RUQ pain with nausea and vomiting, especially in elderly/diabetic patients. Always do an ECG in anyone with upper abdominal pain.
- Right lower lobe pneumonia — diaphragmatic irritation refers pain to the RUQ. Always get an erect CXR in any patient with RUQ pain and fever [1].
When a patient presents with jaundice + cholestatic LFT, you must differentiate stone from tumour because the management diverges completely. The lecture slides emphasise: "Painless progressive obstructive jaundice in the elderly is malignant biliary obstruction until proven otherwise" [3][5].
The differential of obstructive jaundice is classically organised by the anatomical relationship to the bile duct wall [3]:
| Location | Cause | Key Distinguishing Features |
|---|---|---|
| Intraluminal | Choledocholithiasis | Intermittent/fluctuating jaundice, colicky pain, history of gallstones; USG: stone in CBD |
| RPC (Recurrent Pyogenic Cholangitis) | SE Asian patient, recurrent cholangitis episodes, intrahepatic ductal dilatation with stones, left lobe predominance [1][2] | |
| Mural (wall of duct) | Cholangiocarcinoma | Painless progressive jaundice; perihilar (Klatskin) → early jaundice; CA19-9 ↑; MRCP: stricture without stone [3][5] |
| Primary sclerosing cholangitis (PSC) | Young male with IBD (especially UC); multifocal strictures + dilatation ("beading" on MRCP); ↑ ALP; p-ANCA +ve [1] | |
| Extramural (extrinsic compression) | CA head of pancreas | Painless progressive obstructive jaundice; palpable gallbladder (Courvoisier's sign); double duct sign on CT (dilated CBD + pancreatic duct); weight loss; new-onset DM [5][6] |
| Periampullary carcinoma | Jaundice + melaena (ulceration into duodenum); ampullary tumour visible on duodenoscopy at ERCP | |
| Lymphadenopathy (porta hepatis nodes) | History of lymphoma, metastatic disease; CT: enlarged nodes compressing CBD | |
| Mirizzi syndrome | Gallstone at Hartmann's pouch compressing CHD extrinsically; jaundice with palpable GB (exception to Courvoisier's Law); biliary dilatation above level of GB neck with normal CBD below [1][2] |
Differentiating stone vs tumour at the bedside — the critical clinical question [3]:
| Feature | Gallstone (Benign) | Malignant Biliary Obstruction |
|---|---|---|
| Pain | Present (colicky/RUQ) | Painless (or dull, progressive) |
| Jaundice pattern | Fluctuating / intermittent | Progressive, unrelenting |
| Fever | Common (cholangitis) | Uncommon (unless stent-related) |
| Weight loss | Uncommon | Marked |
| Palpable GB | Not palpable (fibrosed from chronic cholecystitis) | Palpable (Courvoisier's Law) |
| Age | Any age | Elderly |
| History | Previous biliary colic / stones | May have new-onset DM, back pain |
Imaging approach [5]: Ultrasound / CT is first-line for obstructive jaundice to determine: (i) size of bile duct (dilated = obstructive), (ii) level of obstruction (intrahepatic vs hilar vs distal), (iii) cause of obstruction (stone vs mass), and (iv) other associated features (staging for malignant disease; complications for benign disease e.g., gallstones) [5].
When the patient presents with Charcot's triad or Reynolds' pentad, the differential includes [1]:
| Condition | How to Differentiate |
|---|---|
| Acute cholangitis (from choledocholithiasis) | Most common cause; dilated CBD with stone on USG; cholestatic LFT + leucocytosis |
| RPC | SE Asian patient; intrahepatic pigment stones; strictures on MRCP; recurrent episodes [1][2] |
| Acute cholecystitis with choledocholithiasis | Murphy's sign positive; GB wall thickening on USG; CBD may also be dilated |
| Liver abscess (pyogenic / amoebic) | Swinging fever; USG/CT: focal intrahepatic collection; blood cultures may grow gut organisms; no biliary dilatation unless secondary [1] |
| Infected choledochal cyst | Young patient (usually < 10y); RUQ mass + pain + jaundice + fever; USG: cystic dilatation of bile duct; MRCP for anatomy [5] |
| Biliary leaks (post-surgical) | History of recent biliary surgery; biloma on imaging |
| Acute pancreatitis | May coexist; epigastric pain radiating to back; ↑ amylase/lipase [1] |
| Acute hepatitis | Hepatocellular LFT pattern (AST/ALT > > ALP); viral serology positive |
| Malignant biliary obstruction with secondary infection | Progressive jaundice → superimposed infection (especially post-stent); mass on CT; CA19-9 elevated [3][5] |
When gallstone pancreatitis is suspected, you must exclude other causes of acute pancreatitis. The mnemonic GAME ID is useful [2]:
| Letter | Cause | Clue |
|---|---|---|
| G | Gallstones (MC — 55%) [4] | History of biliary colic; ↑ ALP; stones on USG |
| A | Alcohol (35%) [4] | History of binge drinking; ↑ AST; MCV elevated |
| M | Metabolic (hypertriglyceridaemia, hypercalcaemia) | Lipid panel; calcium level |
| E | ERCP (post-procedural) | Within 24h of ERCP |
| I | Idiopathic (10%) | Diagnosis of exclusion |
| D | Drugs (NSAIDs, steroids, azathioprine, valproate) | Drug history |
| Others: trauma, infections (mumps), autoimmune (SLE), tumours, pancreatic divisum | Context-dependent |
This is foundational to the differential diagnosis of any jaundice and highly relevant when a patient with "gallstones" presents with yellow skin [3]:
| Feature | Pre-hepatic (Haemolysis) | Hepatic (Hepatocellular) | Post-hepatic (Obstructive) |
|---|---|---|---|
| Bilirubin type | Unconjugated | Mixed | Conjugated |
| Urine colour | Normal | Dark | Tea-coloured (conjugated bilirubin is water-soluble → filtered by kidneys) |
| Stool colour | Normal/dark | Variable | Pale / clay-coloured (no bilirubin reaching gut) |
| Pruritus | No | ± | Yes (bile salt deposition in skin) |
| LFT pattern | ↑ unconj. bilirubin | ↑ AST/ALT > > ALP | ↑ ALP, ↑ GGT > > AST/ALT |
| Examples | Thalassaemia, G6PD, sickle cell | Hepatitis, cirrhosis, drugs | Gallstones, tumours, PSC |
History-taking tip from the senior notes [3]: Ask about urine colour (tea-coloured = obstructive) and stool colour (pale, floating, foul-smelling steatorrhoea = obstructive). Also exclude non-biliary causes of dark urine: rifampicin, Pyridium, beetroot [3].
Once you suspect gallstone disease, the following algorithmic thinking helps you navigate the DDx:
| Condition | Relevance | Key Features |
|---|---|---|
| Recurrent pyogenic cholangitis (RPC) | "Hong Kong disease" — must consider in any local patient with recurrent cholangitis + intrahepatic stones | Brown pigment stones in intrahepatic ducts (especially left lobe); stasis + stricturing + recurrent infection cycle; parasites (Clonorchis sinensis); complications include cholangiocarcinoma [1][2] |
| Choledochal cyst | Congenital dilatation of biliary system; most diagnosed before age 10 | RUQ mass + pain + jaundice + fever; pancreatitis; risk of cholangiocarcinoma; Todani classification (Type I most common); excision + Roux-en-Y hepaticojejunostomy [2][5] |
| Cholangiocarcinoma | Can mimic choledocholithiasis with obstructive jaundice | Painless progressive jaundice; Klatskin tumour (perihilar) most common; CA 19-9 elevated; differentiate from stone on MRCP (stricture without stone vs. filling defect) [1] |
| Pancreatic carcinoma | CA head of pancreas is the classic cause of painless obstructive jaundice | Double duct sign on CT; Courvoisier's sign positive (palpable non-tender GB); new-onset DM; weight loss [5][6] |
| IgG4-related cholangitis | Immune-mediated; can mimic cholangiocarcinoma | Mostly elderly males; ↑ serum IgG4; steroid-responsive; associated with autoimmune pancreatitis [3] |
High Yield DDx Summary for Exams
When asked "DDx of gallstones", think systematically:
-
Differentiate within gallstone complications first: biliary colic vs cholecystitis vs choledocholithiasis vs cholangitis vs pancreatitis vs Mirizzi vs gallstone ileus — use pain duration, fever, jaundice, Murphy's sign, and labs.
-
Then differentiate from non-gallstone mimics based on the presenting complaint:
- RUQ pain: PUD, hepatitis, liver abscess, appendicitis, RLL pneumonia, inferior MI, renal colic
- Obstructive jaundice: CA head of pancreas (Courvoisier +), cholangiocarcinoma, PSC, Mirizzi, choledochal cyst
- Cholangitis: RPC, liver abscess, infected choledochal cyst, biliary leak
- Pancreatitis: GAME ID (Gallstones, Alcohol, Metabolic, ERCP, Idiopathic, Drugs)
-
Imaging first-line: USG/CT to determine duct size, level of obstruction, cause, and associated features [5].
-
Courvoisier's Law helps distinguish stone from tumour: palpable GB + painless jaundice = tumour until proven otherwise.
-
Polyp vs stone on USG: polyp = fixed, no shadow; stone = gravity-dependent, posterior acoustic shadow.
Active Recall - DDx of Gallstones
References
[1] Senior notes: felixlai.md (Cholelithiasis, Cholecystitis, Acute Cholangitis, Mirizzi Syndrome, Acute Pancreatitis, Cholangiocarcinoma, Gallbladder Cancer, RPC sections) [2] Senior notes: maxim.md (Gallstone Diseases, Biliary Colic, Acute Cholecystitis, Choledocholithiasis, Mirizzi Syndrome, Gallstone Ileus, RPC, Acute Cholangitis, Acute Pancreatitis, GB Polyps, GB Carcinoma, Pancreatic Carcinoma, Choledochal Cyst sections) [3] Lecture slides: GC 200. RUQ pain, jaundice and fever Cholecytitis and cholangitis Imaging of GI system.pdf [4] Lecture slides: Acute pancreatitis.pdf [5] Lecture slides: Malignant biliary obstruction.pdf [6] Senior notes: maxim.md (Pancreatic carcinoma section)
Diagnostic Criteria, Diagnostic Algorithm & Investigation Modalities
1. Diagnostic Criteria by Clinical Presentation
Gallstones don't have a single set of diagnostic criteria — the criteria change depending on which clinical syndrome the patient is presenting with. Think of it as asking: "What is the stone doing right now?" Each scenario has its own formal criteria or clinical definition.
There are no formal "criteria" for biliary colic per se. It is a clinical diagnosis confirmed by imaging. You diagnose it by putting together the story and the ultrasound:
| Component | Required |
|---|---|
| Characteristic pain | Steady (not colicky) RUQ/epigastric pain, < 6 hours, post-prandial (fatty meal), radiating to right shoulder/scapula |
| No systemic inflammation | Afebrile, normal WCC, normal CRP |
| Normal or near-normal LFT | If cholestatic LFT → think choledocholithiasis; if ↑ amylase → think pancreatitis |
| USG: gallstones present | Hyperechoic stone with posterior acoustic shadowing, gravity-dependent [2][3] |
| No GB wall abnormality | No wall thickening, no pericholecystic fluid, no sonographic Murphy's sign |
The key principle: biliary colic = stone + characteristic pain + no inflammation + no obstruction. The moment you add fever, leucocytosis, positive Murphy's sign, or cholestatic LFT, you've moved beyond simple biliary colic into a complication.
The Tokyo Guidelines provide the standard diagnostic criteria for acute cholecystitis [1][2][3]. The diagnosis is made by combining local signs, systemic signs, and imaging findings.
| Category | Criteria |
|---|---|
| A: Local signs of inflammation | Murphy's sign; RUQ mass / pain / tenderness |
| B: Systemic signs of inflammation | Fever; Leukocytosis; Elevated CRP |
| C: Imaging findings | Imaging findings characteristic of acute cholecystitis (see USG 5 cardinal signs below) |
Interpretation [1]:
| Diagnosis Level | Requirement |
|---|---|
| Suspected diagnosis | One item in A + One item in B |
| Definite diagnosis | One item in A + One item in B + C (confirmatory imaging) |
Tokyo Guidelines — Must Know!
The Tokyo criteria are straightforward: local signs + systemic signs = suspected; add imaging confirmation = definite. In the exam, if you are asked "how do you diagnose acute cholecystitis?", state the Tokyo criteria explicitly. The 5 cardinal USG signs are the imaging component [2]:
- Presence of gallstones
- Distended GB ( > 4 × 10 cm)
- GB wall thickening > 3 mm
- Pericholecystic fluid / stranding
- Sonographic Murphy sign
The Tokyo Guidelines also grade severity (important for management decisions):
| Grade | Severity | Definition |
|---|---|---|
| Grade I (Mild) | No organ dysfunction; mild inflammatory disease in an otherwise healthy patient | Does not meet Grade II or III criteria |
| Grade II (Moderate) | Associated with any of: WCC > 18,000; palpable RUQ mass; duration > 72h; marked local inflammation (gangrenous, emphysematous, pericholecystic abscess, hepatic abscess, biliary peritonitis) | Significant local inflammation but no organ dysfunction |
| Grade III (Severe) | Associated with organ dysfunction in any one system | Cardiovascular (hypotension requiring pressors), neurological (↓ consciousness), respiratory (PaO2/FiO2 < 300), renal (oliguria, Cr > 2.0), hepatic (INR > 1.5), haematological (platelets < 100,000) |
Why does severity grading matter? Because Grade I → elective/early LC; Grade II → early LC with more careful perioperative support; Grade III → initial organ support + percutaneous cholecystostomy (PTC) if unfit for surgery, with delayed LC once stabilised [2].
The TG18 criteria for acute cholangitis follow a similar logic — systemic inflammation + biliary obstruction [1]:
| Component | Criteria |
|---|---|
| A: Systemic inflammation | Fever ( > 38°C) / shaking chills OR Laboratory evidence of inflammatory response (abnormal WCC / ↑ CRP / other changes) |
| B: Cholestasis | Jaundice OR Abnormal liver chemistries (↑ AST/ALT/ALP/GGT) |
| C: Imaging | Biliary dilatation on imaging AND Evidence of aetiology (stone, stricture, or stent on imaging) |
Interpretation [1]:
| Diagnosis Level | Requirement |
|---|---|
| Suspected diagnosis | One item in A + One item in B |
| Definite diagnosis | Suspected diagnosis + BOTH items in C (biliary dilatation + identified aetiology on imaging) |
Severity grading of acute cholangitis (TG18):
| Grade | Severity | Definition |
|---|---|---|
| Grade I (Mild) | Responds to initial medical treatment (antibiotics + supportive care) | No organ dysfunction, responds within 24–48h |
| Grade II (Moderate) | Does not respond to initial treatment; requires biliary drainage | Two or more of: WCC > 12,000 or < 4,000; fever ≥ 39°C; age ≥ 75; bilirubin ≥ 5 mg/dL; albumin < 0.7× lower normal limit |
| Grade III (Severe) | Organ dysfunction in any one system | Same organ dysfunction criteria as cholecystitis Grade III — this is essentially Reynolds' pentad territory: septic shock + altered mental status [1][2] |
Cholangitis Grading Drives Urgency of Drainage
Grade III (severe) cholangitis = urgent biliary drainage within 24 hours (ERCP first-line). Do NOT wait. Grade II = early biliary drainage within 24–48 hours. Grade I = may respond to antibiotics alone, but if no improvement → biliary drainage. The key teaching point: the sicker the patient, the more urgent the drainage [2][3].
Choledocholithiasis does not have formal diagnostic criteria like cholecystitis/cholangitis. Instead, you risk-stratify to decide which investigation to use — this is the critical decision-making step [1][2]:
| Risk Level | Predictors | Next Investigation |
|---|---|---|
| High risk | CBD stone visible on USG; or clinical acute cholangitis; or bilirubin > 4 mg/dL + dilated CBD | Proceed directly to ERCP (diagnostic + therapeutic) [1][2] |
| Intermediate risk | Abnormal LFT (cholestatic pattern) but no stone seen on USG; dilated CBD ( > 8 mm) without visible stone; age > 55; clinical gallstone pancreatitis | MRCP or EUS first (non-invasive confirmation before committing to ERCP) [1][2] |
| Low risk | Normal LFT, normal CBD calibre, no clinical features of obstruction | No further biliary imaging needed — proceed to elective cholecystectomy ± intraoperative cholangiogram (IOC) [1] |
Why not just do ERCP on everyone? Because ERCP is invasive with significant complications (post-ERCP pancreatitis in 3–10%, perforation, haemorrhage, cholangitis). It should be reserved for cases where you are confident there IS a CBD stone to treat, or when the patient needs urgent therapeutic drainage [1][2].
Acute pancreatitis (of any cause) requires 2 out of 3 of the following [1]:
| Criterion | Detail |
|---|---|
| 1. Characteristic abdominal pain | Epigastric pain radiating to the back, severe, persistent |
| 2. Serum amylase or lipase ≥ 3× upper limit of normal | Lipase preferred (more sensitive, stays elevated longer) |
| 3. Imaging findings | CT/MRI showing pancreatic inflammation (oedema, necrosis, peripancreatic fluid) |
You attribute it to gallstones (rather than alcohol/other causes) when:
- Gallstones are present on USG
- ↑ ALP (suggests biliary origin rather than alcoholic — suspect gallstones if ALP elevated) [2]
- ↑ ALT > 3× ULN within 48h has high positive predictive value for gallstone aetiology
- No history of significant alcohol intake
- ↑ AST more suggestive of alcohol [2]
The following algorithm synthesises the approach from first presentation to definitive investigation. This is how you should think on a ward round:
3. Investigation Modalities — Detailed Breakdown
| Investigation | What to Order | Key Findings & Interpretation | Pathophysiological Basis |
|---|---|---|---|
| CBC with differential count | FBC, WCC, neutrophils, band forms | Normal in biliary colic; ↑ WCC with left shift in cholecystitis/cholangitis; very high WCC ( > 18,000) → gangrenous cholecystitis/perforation [1] | Bacterial infection → bone marrow releases immature neutrophils (bands) |
| CRP | Inflammatory marker | Elevated in cholecystitis, cholangitis; serial monitoring useful for treatment response | Acute-phase reactant synthesised by liver in response to IL-6 |
| LFT | Bilirubin, ALP, GGT, AST, ALT, albumin | Normal in biliary colic; Liver chemistry usually NORMAL in acute cholecystitis but mild elevation may occur [1]; cholestatic pattern (↑ ALP, ↑ GGT > > ↑ AST/ALT) in choledocholithiasis/cholangitis; ↑ AST/ALT early, then ↑ ALP/GGT later in the course of biliary obstruction [1] | ALP/GGT are located on the canalicular membrane of hepatocytes → biliary obstruction → bile backs up → ↑ synthesis and release of these enzymes; AST/ALT leak from damaged hepatocytes due to bile toxicity |
| Conjugated bilirubin predominates | In obstructive jaundice, bilirubin is conjugated but cannot be excreted → refluxes into blood | Conjugated bilirubin is water-soluble → filtered by kidneys → dark/tea-coloured urine; no bilirubin reaches gut → pale stools | |
| Serum amylase / lipase | Lipase preferred | ≥ 3× ULN → diagnose acute pancreatitis; lipase rises within 4–8 hours, peaks at 24 hours, persists up to 2 weeks [1]; amylase rises earlier but returns to normal faster (3–5 days) | Pancreatic acinar cell injury → enzyme leak into blood. Lipase is more specific (amylase also elevated in salivary gland disease, macroamylasaemia, bowel obstruction) |
| Clotting profile | PT/INR | May be prolonged in obstructive jaundice | No bile salts in gut → no fat absorption → no vitamin K absorption (fat-soluble vitamin) → ↓ synthesis of factors II, VII, IX, X → prolonged PT [1] |
| Blood cultures | Aerobic + anaerobic bottles | Must send in suspected cholangitis BEFORE starting antibiotics [2] | Bacteraemia in cholangitis from translocation of gut organisms (E. coli, Klebsiella) through inflamed biliary mucosa into portal/systemic circulation |
| RFT | Urea, creatinine, electrolytes | Assess for dehydration, sepsis-related AKI, baseline before contrast imaging | Sepsis → pre-renal AKI; obstructive jaundice → hepatorenal syndrome (rare) |
| Urinalysis | Bilirubin, urobilinogen | Conjugated bilirubin positive in obstructive jaundice; urobilinogen absent (because no bilirubin reaches the gut to be converted) [1] | Confirms obstructive mechanism |
| Tumour markers | CA 19-9, CEA | NOT diagnostically useful (lack sensitivity and specificity); useful for monitoring after resection for recurrence [1] | CA 19-9 elevated in cholangiocarcinoma, pancreatic cancer, but also in benign cholangitis, pancreatitis — low specificity |
| Cardiac markers + ECG | Troponin, 12-lead ECG | Exclude myocardial infarction as a mimic of epigastric/RUQ pain [1] | Inferior MI (RCA territory) → diaphragmatic irritation → referred epigastric/RUQ pain |
| Erect CXR | PA chest film | Rule out right lower lobe pneumonia (RUQ pain mimic); air under diaphragm (perforated viscus); pleural effusion (pancreatitis complication) | Diaphragmatic irritation from RLL consolidation → referred RUQ pain |
| AXR | Supine abdomen | Only ~15% gallstones visible (pigment stones are radiopaque); Mercedes-Benz sign (gas in stone fissures); pneumobilia (gallstone ileus, post-ERCP); Rigler's triad (pneumobilia + SBO + ectopic stone = gallstone ileus) [2]; sentinel loop / colon cut-off sign (pancreatitis) | Limited sensitivity — USG is far superior for gallstones |
LFT Interpretation in Biliary Disease — A Key Concept
The temporal evolution of LFT in biliary obstruction is important [1]:
- Early (first 24–48h): ↑ AST and ALT — because back-pressure of bile causes hepatocyte damage → transaminase leak. ALT may transiently spike to > 1000 IU/L, mimicking hepatitis.
- Later (days to weeks): ↑ ALP and GGT predominate — the classic "cholestatic pattern" — as the biliary epithelium upregulates ALP synthesis in response to obstruction.
- If you catch the patient early, the LFT may look "hepatocellular" and fool you into thinking it's hepatitis. Always repeat LFT in 24–48h — the pattern will shift to cholestatic if it's truly obstructive.
3.2 Imaging Modalities
USG is the initial standard imaging study of choice for suspected gallstone disease [1][2][3].
Why USG first? It is readily available, quick, non-invasive, no radiation, no contrast, inexpensive, and has excellent sensitivity for gallbladder stones (~95%). It simultaneously assesses the liver, bile ducts, and pancreas.
| Finding | Significance | Pathophysiological Basis |
|---|---|---|
| Hyperechoic focus with posterior acoustic shadowing | Gallstone in GB | Stone reflects all ultrasound waves (hyperechoic) and blocks transmission behind it (shadow) [2] |
| Gravity-dependent / rolling stone sign | Confirms stone (not polyp) | Stone is mobile, moves when patient changes position; polyp is fixed to wall [1][2] |
| Distended GB ( > 4 × 10 cm) | Cystic duct obstruction (cholecystitis, mucocele) | Bile cannot exit → accumulation → distension |
| GB wall thickening > 3 mm | Inflammation (cholecystitis) | Oedema and inflammatory infiltrate in GB wall |
| Double-wall sign | Wall oedema in cholecystitis | Intramural oedema separates mucosal and serosal layers |
| Pericholecystic fluid | Cholecystitis with serosal inflammation | Exudate from inflamed GB serosa |
| Sonographic Murphy sign | Acute cholecystitis | Pressing USG probe over GB reproduces maximum tenderness (localises inflammation to GB specifically) |
| Contracted, thick-walled GB | Chronic cholecystitis | Fibrosis from repeated inflammation [2] |
| Dilated CBD ( > 8 mm) | Biliary obstruction (choledocholithiasis, tumour) | Back-pressure from distal obstruction dilates the duct proximally [1][2] |
| Stone in CBD | Choledocholithiasis | Only visible in ~1/3 of cases — distal CBD often obscured by duodenal gas [1][2] |
| Dilated intrahepatic ducts | Proximal/hilar obstruction | Obstruction at or above the hilum (Klatskin tumour, RPC) |
| Wall calcification | Porcelain gallbladder | Chronic inflammation → dystrophic calcification of GB wall |
- Operator-dependent — quality varies with sonographer experience
- Limited by body habitus (obesity) and bowel gas (obscures distal CBD and pancreas)
- Poor sensitivity for distal CBD stones (~50%) — the duodenum overlies the distal CBD
- Cannot assess pancreatic necrosis or stage malignancy
CBD diameter rule of thumb [2]: Normal ≤ 6 mm. Add ~1 mm per decade over 60. Post-cholecystectomy, up to 10 mm may be acceptable (the CBD dilates to compensate for loss of the gallbladder reservoir). If ≥ 8 mm with gallstones and biliary pain → suspicious for choledocholithiasis [1].
"HIDA" = Hepatic IminoDiacetic Acid — a technetium-99m labelled radiotracer (99mTc-HIDA) that is taken up by hepatocytes and excreted into bile, mimicking bilirubin metabolism [1][2].
| Aspect | Detail |
|---|---|
| Principle | Radiotracer injected IV → taken up by liver → excreted into bile → normally fills GB within 30 min and enters duodenum within 60 min |
| Positive for acute cholecystitis | Non-visualisation of the gallbladder after 4 hours (because the cystic duct is obstructed → tracer cannot enter GB) [1] |
| Chronic cholecystitis | Delayed or reduced GB filling [2] |
| Normal HIDA | Excludes acute cholecystitis — high negative predictive value [1] |
| Sensitivity/Specificity | ~95% / ~90% — highly accurate but expensive and time-consuming |
| Limitation | Not useful in jaundiced patients — the liver cannot excrete the tracer if bilirubin is very high (competitive inhibition at the hepatocyte canalicular membrane) [1] |
| Morphine augmentation | Morphine IV → ↑ sphincter of Oddi pressure → forces bile into the GB if the cystic duct is patent → if GB still not seen, confirms obstruction. Used when HIDA is equivocal [2] |
| When to use | When USG is inconclusive and clinical suspicion for acute cholecystitis remains high [1][2] |
"MRCP" is a non-contrast, T2-weighted MRI sequence that exploits the fact that stationary fluid (bile, pancreatic juice) appears bright white on T2, giving a "cholangiogram-like" image without any contrast or endoscopy [2].
| Aspect | Detail |
|---|---|
| Principle | T2 weighting → static fluid (bile) = bright signal; surrounding soft tissue = dark. Creates a "roadmap" of the biliary tree and pancreatic duct |
| Sensitivity for CBD stones | ~90–95% (far superior to USG for CBD/cystic duct stones) |
| Advantages | Non-invasive, no contrast, no radiation, no sedation; superior to USG for cystic duct and distal CBD stones; can differentiate inflammatory from neoplastic masses on T2 images [1] |
| Limitations | NOT therapeutic — can only diagnose, cannot treat (unlike ERCP); lower spatial resolution for very small stones ( < 3 mm); claustrophobia; not widely available in emergency settings; contraindicated with some metallic implants |
| When to use | Intermediate risk of choledocholithiasis — when you want to confirm/exclude CBD stones before committing to ERCP [1][2]; to delineate biliary anatomy before surgery; Mirizzi syndrome workup [1] |
MRCP has largely replaced diagnostic ERCP for choledocholithiasis. The principle is: use MRCP to diagnose, then proceed to ERCP only if a stone is confirmed and needs extraction [1].
| Aspect | Detail |
|---|---|
| Principle | High-frequency ultrasound transducer mounted on an endoscope → positioned in the duodenum or stomach → gives close-range, high-resolution images of the CBD, pancreas, and ampulla without bowel gas interference |
| Sensitivity for CBD stones | ~95% — equivalent to or better than MRCP, especially for small stones ( < 5 mm) |
| Advantages | Overcomes the bowel gas limitation of transabdominal USG; excellent for distal CBD; can assess pancreatic masses and perform FNA/biopsy simultaneously |
| Limitations | Invasive (requires sedation, endoscopy); operator-dependent; not universally available |
| When to use | Intermediate risk of choledocholithiasis when MRCP is contraindicated (e.g., metallic implants); when MRCP is negative but clinical suspicion remains high [1]; staging of periampullary/pancreatic tumours [2] |
ERCP is both diagnostic and therapeutic — but should be reserved for patients with HIGH risk of CBD stones or who need urgent biliary drainage [1][2][3].
| Aspect | Detail |
|---|---|
| Principle | Side-viewing duodenoscope → cannulation of the ampulla of Vater → contrast injection into CBD/pancreatic duct → fluoroscopic imaging; allows simultaneous intervention |
| Diagnostic findings | Filling defects (stones), strictures, dilatation, cholecystobiliary fistula (Mirizzi), tumour |
| Therapeutic capabilities | Sphincterotomy (cutting the sphincter of Oddi to widen the ampullary opening); stone extraction (balloon or basket); mechanical lithotripsy (crushing large stones); biliary stent placement (for obstruction from stricture/tumour); biliary drainage (for cholangitis) [1][2] |
| Complications | Post-ERCP pancreatitis (3–10%) — most common; perforation; haemorrhage (post-sphincterotomy); cholangitis; basket impaction. Reduced by prophylactic rectal NSAIDs or temporary pancreatic stent [2] |
| When to use | High risk of CBD stone (stone seen on imaging, acute cholangitis, bilirubin > 4 + dilated CBD) [1]; urgent biliary drainage in acute cholangitis (first-line, Grade II–III) [2][3]; confirmed CBD stone on MRCP/EUS needing extraction |
| When NOT to use | Low/intermediate probability of CBD stone without prior non-invasive confirmation; sole diagnostic purpose when MRCP/EUS can answer the question |
| Aspect | Detail |
|---|---|
| Principle | Cross-sectional imaging with IV contrast; arterial, portal venous, and delayed phases |
| Sensitivity for gallstones | Only ~75% — many cholesterol stones are isodense with bile on CT [2]. USG is superior for gallbladder stones |
| When CT excels | Complications of cholecystitis (empyema, emphysematous cholecystitis — gas in GB wall, perforation, abscess) [2]; staging malignancy (cholangiocarcinoma, pancreatic cancer, GB cancer — assessing vascular invasion, LN involvement, distant metastases) [1][5]; acute pancreatitis — gold standard (Sn 90%, Sp 100%) for detecting necrosis, peripancreatic collections; CT changes may NOT appear within first 24 hours [1]; gallstone ileus (Rigler's triad much more sensitive on CT than AXR) [2] |
| Specific CT findings | Emphysematous cholecystitis: gas within GB wall/lumen; Porcelain GB: curvilinear calcification of GB wall; Double duct sign: dilated CBD + dilated pancreatic duct → pancreatic head mass [2]; Pancreatic necrosis: lack of enhancement with IV contrast [1] |
| Aspect | Detail |
|---|---|
| Principle | Percutaneous needle inserted through the liver into an intrahepatic bile duct under fluoroscopic guidance → contrast injection → imaging of biliary tree |
| Diagnostic | Visualisation of biliary tree anatomy above an obstruction |
| Therapeutic | PTBD (percutaneous transhepatic biliary drainage) — external drain or internal stent to decompress obstructed bile ducts |
| Preferred over ERCP when | Obstruction at or above the confluence of hepatic ducts (e.g., Klatskin tumour, PSC, RPC) — ERCP cannot access above a complete hilar obstruction [2]; failed ERCP; surgically altered anatomy (e.g., Roux-en-Y) making endoscopic access impossible |
| Complications | Bacteraemia (antibiotic prophylaxis required), haemobilia, bile leak, pneumothorax [2] |
| Aspect | Detail |
|---|---|
| Principle | During laparoscopic cholecystectomy, contrast is injected via the cystic duct under fluoroscopy → images the CBD in real-time |
| Purpose | Detects residual/unsuspected CBD stones (present in ~5–10% of patients undergoing LC for gallstones); confirms biliary anatomy to avoid CBD injury |
| When to use | Low risk of CBD stones → LC with IOC (instead of pre-op MRCP); any case where anatomy is uncertain during surgery [1] |
| Clinical Scenario | First-Line Imaging | Second-Line / Confirmatory | Therapeutic |
|---|---|---|---|
| Biliary colic | USG (stones, no GB inflammation) | — | — (→ Elective LC) |
| Acute cholecystitis | USG (5 cardinal signs) | HIDA scan (if USG inconclusive); CT (if complications suspected) [1][2] | — (→ LC or PTC) |
| Choledocholithiasis (low risk) | USG | IOC during LC | LC + IOC |
| Choledocholithiasis (intermediate risk) | USG | MRCP or EUS [1][2] | ERCP if stone confirmed |
| Choledocholithiasis (high risk) | USG | — | ERCP directly (diagnostic + therapeutic) [1][2] |
| Acute cholangitis | USG (dilated CBD, stone, r/o liver abscess) | MRCP if ERCP delayed/unavailable | ERCP (1st line) [2][3] |
| Gallstone pancreatitis | USG (gallstones, CBD) | CT abdomen (if severe / after 72h); MRCP for CBD stone if intermediate risk | ERCP (if concurrent cholangitis or confirmed CBD stone) [1] |
| Mirizzi syndrome | USG (dilated ducts above GB neck, stone at neck, contracted GB) [1] | MRCP (high sensitivity); CT (r/o malignancy) [1] | ERCP (diagnostic + stenting) [1] |
| Gallstone ileus | AXR (Rigler's triad) | CT abdomen (much more sensitive) [2] | Surgical (enterolithotomy) |
| Malignant biliary obstruction | USG + CT [5] | MRCP; EUS (staging + FNA) | ERCP (stenting for palliation) or PTC (if hilar obstruction) |
Imaging for obstructive jaundice [5]: The lecture slides emphasise that USG / CT should assess: (i) Size of bile duct, (ii) Level of obstruction, (iii) Cause of obstruction, (iv) Other associated features — staging for malignant disease; complications for benign disease (gallstones) [5].
| Condition | USG Findings |
|---|---|
| Gallstone | Hyperechoic + posterior acoustic shadow + gravity-dependent [2] |
| GB polyp | Hyperechoic + NO posterior shadow + NOT gravity-dependent + may have vascularity on Doppler [2] |
| Acute cholecystitis | 5 cardinal signs (stones, distended GB, wall > 3mm, pericholecystic fluid, sono-Murphy) [2] |
| Chronic cholecystitis | Contracted GB + wall thickening + stones [2] |
| Choledocholithiasis | Dilated CBD > 8 mm ± visible stone (only 1/3 seen due to bowel gas) [1][2] |
| Porcelain GB | Curvilinear echogenic focus with posterior shadowing in GB wall (calcification) |
| Mirizzi syndrome | Dilated ducts ABOVE GB neck + stone at GB neck + normal CBD BELOW stone + contracted GB [1] |
| Cholangitis | Dilated CBD ± stone; may show liver abscess [2] |
| GB cancer | Thickened irregular wall > 3 mm; mass protruding into lumen; loss of GB-liver interface; LN [1] |
High Yield Summary — Diagnosis of Gallstones
- Biliary colic = clinical diagnosis; USG confirms stones + normal GB wall + no systemic inflammation.
- Acute cholecystitis = Tokyo criteria: 1 local sign + 1 systemic sign = suspected; + imaging = definite. 5 cardinal USG signs are the imaging gold standard.
- HIDA scan = second-line when USG is inconclusive; non-visualisation of GB = cystic duct obstruction = cholecystitis.
- Acute cholangitis = TG18 criteria: systemic inflammation + cholestasis = suspected; + biliary dilatation with identified cause on imaging = definite. Severity grading dictates urgency of biliary drainage.
- Choledocholithiasis = risk-stratify: High → ERCP directly; Intermediate → MRCP/EUS first; Low → LC + IOC.
- USG is first-line for all gallstone presentations. It is limited for distal CBD stones (bowel gas).
- MRCP has replaced diagnostic ERCP — use MRCP to confirm, ERCP to treat.
- ERCP is reserved for high-risk CBD stones and urgent biliary drainage — it is invasive with significant complication risk (pancreatitis 3–10%).
- CT is best for complications (emphysematous cholecystitis, perforation, pancreatitis necrosis, staging malignancy) and is NOT the first choice for detecting gallstones (only 75% sensitivity).
- LFT evolution: Early obstruction → ↑ AST/ALT; Later → ↑ ALP/GGT (cholestatic pattern). Always repeat LFT in 24–48h.
- Always send blood cultures in suspected cholangitis BEFORE antibiotics.
- Always do ECG + erect CXR to exclude MI and RLL pneumonia as RUQ pain mimics.
Active Recall - Diagnosis of Gallstones
References
[1] Senior notes: felixlai.md (Cholelithiasis, Cholecystitis — Tokyo criteria, Acute Cholangitis — TG18 criteria, Mirizzi Syndrome, Acute Pancreatitis, Gallbladder Cancer diagnostic sections) [2] Senior notes: maxim.md (Gallstone Diseases, Biliary Colic investigations, Acute Cholecystitis — 5 cardinal signs and Tokyo table, Choledocholithiasis — risk stratification, Acute Cholangitis — urgent investigations, HBP investigations — USG/EUS/CT/HIDA/MRCP/PTC/ERCP, Gallstone Ileus, GB Polyps) [3] Lecture slides: GC 200. RUQ pain, jaundice and fever Cholecytitis and cholangitis Imaging of GI system.pdf [5] Lecture slides: Malignant biliary obstruction.pdf
Management of Gallstones — Treatment Algorithm & Modalities
The management of gallstones is dictated by a single question: "What is the stone doing right now?" The treatment is entirely different for an asymptomatic stone sitting quietly in the gallbladder versus one causing septic shock from cholangitis. Let's work through each scenario systematically.
Before diving into specifics, three management principles apply across all gallstone presentations:
- Resuscitate first, investigate second, intervene third — especially in cholangitis and pancreatitis. You cannot ERCP a dead patient.
- Remove the gallbladder to prevent recurrence — almost every gallstone complication eventually leads back to laparoscopic cholecystectomy (LC) as the definitive treatment to eliminate the stone factory [1][2].
- Biliary decompression is life-saving in obstruction with sepsis — when bacteria are trapped behind an obstruction, antibiotics alone cannot penetrate adequately because bile is not flowing. You must physically drain the system [1][2][3].
3. Management by Clinical Scenario
Most gallstones (80%) are asymptomatic. The question is: when do you leave them alone versus operate prophylactically?
Default approach: Watchful waiting [2]
- Risk of future complications: only 1–4% per year [2]
- Risk factor modification: weight management, dietary changes, control of diabetes
- Ursodeoxycholic acid (UDCA): An oral bile acid that works by reducing cholesterol secretion into bile and promoting cholesterol desaturation → gradual dissolution of cholesterol stones over months to years. Only effective for cholesterol stones (not pigment), small stones ( < 1 cm), and functioning gallbladder (patent cystic duct). Rarely used in practice because of low efficacy and high recurrence (50% within 5 years after stopping) [2].
Indications for prophylactic cholecystectomy in asymptomatic patients [1][2]:
| Indication | Rationale |
|---|---|
| Porcelain gallbladder | Calcification of GB wall → 2–3% risk of malignancy → absolute indication for cholecystectomy [1][2] |
| GB polyps ≥ 1 cm | Risk of malignancy 46% at 1.5 cm; adenomatous polyps ≥ 1 cm (or ≥ 8 mm if underlying PSC) [2] |
| Large gallstones > 3 cm | Increased risk of GB carcinoma [2] |
| Concomitant haemolytic disorders | Ongoing production of pigment stones; stones will inevitably become symptomatic |
| Patients on long-term TPN | No CCK stimulus → perpetual GB stasis → high risk of cholecystitis [1] |
| Gastric bypass / bariatric surgery | Altered anatomy makes future ERCP extremely difficult; rapid weight loss → stone formation |
| Concomitant liver surgery | Opportunistic removal during another hepatobiliary procedure |
Acute management [2]:
- NPO (nil by mouth) — rest the gut, reduce CCK stimulation
- Analgesia — NSAIDs are preferred first-line (e.g., diclofenac, ketorolac) [2]
- Why NSAIDs? They inhibit prostaglandin synthesis → reduce gallbladder mucosal inflammation and smooth muscle spasm. They also avoid opioid-related sphincter of Oddi spasm (morphine → ↑ sphincter of Oddi pressure → worsens biliary obstruction).
- If NSAIDs contraindicated (renal impairment, PUD, allergy) → pethidine (meperidine) or paracetamol + codeine. Morphine should be AVOIDED due to sphincter of Oddi spasm [1].
- IV fluids if dehydrated/vomiting
- Anti-emetics (ondansetron, metoclopramide)
Definitive management: Elective laparoscopic cholecystectomy [2]
- Rationale: once symptomatic, patients tend to have recurrent bouts; elective LC reduces risk of future complications from 25% to 8% [2].
- Timing: can be arranged as an outpatient/elective procedure during the same admission or within weeks.
3.3 Acute Cholecystitis
The management follows a structured approach: initial stabilisation → definitive surgery.
| Intervention | Detail | Rationale |
|---|---|---|
| NPO | Nil by mouth | Bowel rest; reduce CCK-driven GB contraction against obstruction |
| IV fluids | Crystalloid resuscitation | Replace losses from vomiting, fever, third-spacing |
| IV antibiotics [3] | Cefuroxime + Metronidazole (mild-moderate); Piperacillin-tazobactam (Tazocin) (severe) [2][3]; Alternatives: Ampicillin-sulbactam; Metronidazole + 3rd-gen cephalosporin; Metronidazole + fluoroquinolone [1] | Acute cholecystitis is initially chemical inflammation but secondary bacterial infection occurs (E. coli, Klebsiella, Strep. faecalis) → must cover gram-negatives + anaerobes |
| Analgesia | NSAIDs first-line; avoid morphine | Pain control; morphine → sphincter of Oddi spasm |
| Monitor | Vitals, I/O, serial bloods | Detect deterioration: ↑ temperature/pulse, ↓ BP/consciousness/urine output, ↑ abdominal tenderness [1] |
"Surgical treatment = Cholecystectomy (removal of gallbladder) — open or laparoscopic, delayed or early" [3].
The critical decision is timing — early vs. delayed (interval):
| Early LC: within 48–72 hours of symptom onset [3] | Delayed (Interval) LC: after 6–12 weeks [3] |
|---|---|
| Advantages: avoid urgent operation, avoid recurrent symptoms, avoid readmission, shorter hospital stay [3] | Advantages: avoid misdiagnosis, easier dissection, less septic complications, less serious complications [3] |
| Initial inflammation creates pericholecystic fluid → easier tissue-plane dissection [2] | After 72h: dense adhesions form at Calot's triangle → difficult dissection [2] |
| Higher risk of bleeding and post-op infections; higher conversion-to-open rate [2] | Separate admission; fibrosis makes GB mobilisation difficult; chance of recurrence while waiting [2] |
"Early cholecystectomy is safe without increasing the risk of complications" [3] — current evidence and guidelines favour early LC (within 72h) as the standard of care for most patients with acute cholecystitis, as it avoids the morbidity of a second admission and the risk of recurrent complications during the waiting period.
Management by Tokyo Severity Grade [1][2]:
| Grade | Management |
|---|---|
| Grade I (Mild) | Early LC (within 72h) — 1st line for most patients [2][3] |
| Grade II (Moderate) | Early LC with experienced surgeon + careful perioperative support. If local resources/expertise insufficient → antibiotics + delayed LC [1] |
| Grade III (Severe) | Initial organ support + GB drainage → delayed LC when stabilised [1][2] |
| Complicated (gangrene, perforation, emphysematous) | Emergency LC regardless of grade — disease progression despite best supportive care [2] |
Emergency vs Early vs Interval LC
- Emergency LC = performed urgently (same day) for life-threatening complications — gangrene, perforation, emphysematous cholecystitis, or clinical deterioration despite antibiotics [2].
- Early LC = within 48–72 hours of symptom onset — the current standard of care for Grade I–II [3].
- Interval LC = delayed 6–12 weeks after initial conservative management — reserved for late presentations ( > 72h where dense adhesions have already formed), or when early surgery is not feasible [2].
"Drainage of the gallbladder — open or percutaneous. Indications: high surgical risk, haemodynamically unstable, difficult cholecystectomy" [3].
| Modality | Detail |
|---|---|
| Percutaneous transhepatic cholecystostomy (PTC) [2][3] | Catheter inserted percutaneously through the liver into the GB under USG/CT guidance. Trans-hepatic route minimises risk of bile leak (liver tissue tamponades the tract). Decompresses and drains the inflamed/purulent GB. Specific complications: catheter migration, bile leakage, bowel injury [2] |
| Endoscopic drainage | If PTC not feasible: transpapillary drainage via ERCP (catheter placed through cystic duct → either nasobiliary drain externally or internal pigtail stent into duodenum); or transmural EUS-guided drainage (EUS-guided needle puncture of GB → dilation → stent/LAMS placement) [1][2] |
GB drainage is a bridge — it stabilises the patient until they are fit for definitive cholecystectomy.
| Aspect | Detail |
|---|---|
| Approach | Laparoscopic (95% of cases) vs. open (Kocher's subcostal incision) [1][2] |
| Advantages of lap | Less pain, shorter hospital stay, faster recovery, better cosmesis, early return of GI function [1] |
| Disadvantages of lap | Higher risk of major bile duct injury; conversion to open may be needed [1] |
| Positioning | Reversed Trendelenburg (head up) — allows gravity to retract bowel inferiorly, exposing the GB; slightly rotated to left [2] |
| Port placement | 4 ports: 10 mm umbilical (camera), 10 mm epigastric (operating), 5 mm right subcostal (dynamic retraction), 5 mm right flank (static retraction of fundus) [2] |
| Pneumoperitoneum | CO₂ insufflation to ~15 mmHg via Hasson open technique at umbilicus [2] |
| Key landmarks | Retract GB fundus cephalad + Hartmann's pouch laterally → identify Rouviere's sulcus (right posterior portal pedicle) as safety landmark [2] |
Critical View of Safety (CVS) — the most important concept in cholecystectomy [1][2]:
| CVS Criteria | Why |
|---|---|
| 1. Hepatocystic triangle (Calot's triangle) cleared of all fat and fibrous tissue | Ensures no hidden structures (accessory ducts, aberrant arteries) |
| 2. Lower third of GB separated from the cystic plate (liver bed) | Confirms the plane between GB and liver |
| 3. Only two structures seen entering the gallbladder: cystic duct and cystic artery | Misidentification of the cystic duct is the commonest cause of biliary injury [1] — CVS prevents this by ensuring ONLY 2 structures are connected to the GB before clipping/dividing |
Critical View of Safety
Never clip or divide ANY structure during cholecystectomy until the CVS is achieved. If the CVS cannot be obtained due to severe inflammation or unclear anatomy → perform intraoperative cholangiogram (IOC) to delineate the anatomy, or convert to open surgery. Conversion to open is NOT a failure — it is a safety decision [1][2].
Partial (subtotal) cholecystectomy is advocated when ductal and vascular structures in Calot's triangle cannot be safely identified in severe acute inflammation — you leave the posterior wall of the GB attached to the liver bed (Fenestrating technique) or amputate at Hartmann's pouch (Reconstituting technique) [1].
Indications for open cholecystectomy [2]:
| Indication | Rationale |
|---|---|
| Cannot tolerate pneumoperitoneum | Cardiopulmonary comorbidities → CO₂ absorption + increased intra-abdominal pressure → ↓ venous return, ↑ PaCO₂ |
| Refractory coagulopathy | High bleeding risk with laparoscopic approach |
| Multiple previous abdominal surgeries | Dense adhesions make port placement and dissection hazardous |
| Suspected GB carcinoma | Risk of port-site seeding; need for wider resection with LN dissection [2] |
Indications for cholecystectomy (comprehensive) [1][2]:
| Category | Specific Indication |
|---|---|
| Symptomatic gallstones | With or without complications (biliary colic, cholecystitis, choledocholithiasis, pancreatitis) [1][2] |
| Asymptomatic — high risk of GB cancer | Porcelain gallbladder (absolute); GB polyps ≥ 1 cm; large stones > 3 cm [1][2] |
| Asymptomatic — high risk of complications | Long-term TPN; haemolytic disorders; post-bariatric surgery [1] |
| Acalculous cholecystitis | GB inflammation without stones — definitive treatment is cholecystectomy [1] |
| Concomitant surgery | During other hepatobiliary procedures |
3.4 Choledocholithiasis (CBD Stones)
The management has two components: (1) Remove the CBD stone and (2) Remove the gallbladder to prevent recurrence.
| Risk Level | Approach |
|---|---|
| High suspicion (CBD stone on USG, clinical cholangitis, bilirubin > 4 + dilated CBD) | ERCP first → sphincterotomy + stone extraction → interval LC with IOC [1] |
| Intermediate suspicion (cholestatic LFT, dilated CBD without visible stone) | MRCP or EUS first → if stone confirmed → ERCP → LC [1][2] |
| Low suspicion (normal LFT, normal CBD) | LC with IOC → if stone found intraoperatively → laparoscopic ECBD or post-op ERCP [1] |
"First-line approach: Endoscopic retrograde cholangiopancreatography ± biliary stenting" [3].
| Step | Detail | Why |
|---|---|---|
| Endoscopic sphincterotomy | Electrocautery incision through the biliary sphincter of Oddi | Eliminates the principal anatomic barrier to stone passage; widens the ampullary opening for instrument access [1] |
| Stone extraction | Wire baskets (Dormia basket — snares the stone); Stone extraction balloon (Fogarty-type — inflated above stone, pulled down to sweep stone out); Mechanical lithotripsy (crushes large stones that cannot be extracted whole) [1][2] | Different tools for different stone sizes/shapes |
| Papillary balloon dilation (balloon sphincteroplasty) | Alternative to sphincterotomy — dilates ampulla with a balloon to preserve the sphincter | Concerns about long-term sphincter incompetence and ascending cholangitis with sphincterotomy; however, balloon dilation carries higher risk of post-ERCP pancreatitis [1] |
| Timing | Complication | Detail |
|---|---|---|
| Short-term | Pancreatitis (most common, 3–10%) | Reduced by prophylactic rectal NSAIDs or temporary pancreatic stent |
| Perforation | Two types: Intraperitoneal (duodenal perforation → free gas under diaphragm on CXR → requires operative treatment) vs. Retroperitoneal (bile duct perforation at ampulla → retroperitoneal gas, NO free gas under diaphragm → usually conservative management as it seals spontaneously) [1] | |
| Bleeding | Post-sphincterotomy haemorrhage | |
| Infection / cholangitis | Incomplete drainage → residual obstruction + instrumentation | |
| Long-term | Stone recurrence | Especially if gallbladder not removed |
| Papillary stenosis | Scarring of sphincterotomy site |
Relative contraindications for ERCP [3]:
- Altered GI anatomy e.g., Billroth II gastrectomy, Roux-en-Y [3] — the afferent limb anatomy makes duodenoscope access to the ampulla technically very difficult or impossible
- Gastric/bowel obstruction
- Severe coagulopathy (INR > 1.5, platelets < 50,000) — risk of post-sphincterotomy bleeding
When ERCP fails or is contraindicated, CBD stones must be managed surgically.
| Approach | Detail |
|---|---|
| Transcystic exploration (1st line) | Catheter inserted via the cystic duct → cholangiogram → stone extraction with balloon/basket → advantage: avoids opening the CBD itself [2] |
| Choledochotomy (2nd line) | Direct incision into the CBD → stone removed through the defect → choledochoscopy to confirm complete clearance → T-tube or primary closure [2] |
| Percutaneous choledochoscopy | Via mature T-tube tract (6–8 weeks post-insertion) — stones retrieved with baskets/balloons under direct vision [1] |
| Advantage | Can be performed as one-stage surgery together with LC [2] |
T-tube placement after choledochotomy [1]:
| Function | Detail |
|---|---|
| Post-operative biliary decompression | Keeps CBD pressure low while the choledochotomy suture line heals |
| Prevents bile leakage from suture line | Safety valve — bile drains externally if pressure rises |
| Access for post-operative cholangiogram | Check tube cholangiogram at 7–10 days to exclude residual stones |
| Access for choledochoscopy | After 6–8 weeks (fibrous tract formation), scope can be passed through the tract to extract residual stones [1] |
| Complications | Bile leak, infection, tube dislodgement, bile duct obstruction [1][2] |
Modern practice often favours primary closure of the choledochotomy (without T-tube) if a biliary stent is in situ, as T-tubes have been shown to increase complications [2].
3.5 Acute Cholangitis
The management is encapsulated by the mnemonic "RAD" — Resuscitation, Antibiotics, Drainage [2].
"Keep the patient fast. Intravenous fluid. Intravenous antibiotics: Cefuroxime, Metronidazole, Piperacillin + tazobactam" [3].
| Step | Detail | Rationale |
|---|---|---|
| R — Resuscitation | NPO, IV fluids, monitor vitals and I/O Q1h [2] | Correct dehydration, prevent shock; close monitoring to detect clinical deterioration early |
| A — Antibiotics (broad-spectrum, IV) [2][3] | Mild: IV Augmentin (amoxicillin-clavulanate) or cefuroxime + metronidazole; Severe: IV Tazocin (piperacillin-tazobactam) × 7 days [2][3] | Must cover enteric gram-negatives (E. coli, Klebsiella) + anaerobes (Bacteroides); antibiotics alone fail in 15% because bile flow is obstructed → drug cannot reach the infected bile [1] |
| D — Drainage | Urgent if Reynolds' pentad, or not responding to antibiotics within 24h [2] | Obstruction impairs antibiotic secretion into bile → you MUST physically decompress the biliary tree |
QMH practice: ERCP → PTBD → ECBD [1].
| Modality | Detail | When to Use |
|---|---|---|
| ERCP (1st line) [2][3] | Biliary drainage and decompression — aspirate bile and pus → inject contrast → place plastic stent (temporary, requires scheduled change) with or without sphincterotomy; stone removal now or interval ERCP after sepsis resolves [2] | First-line for acute cholangitis [3]; mortality < 5% with endoscopic drainage |
| PTBD (Percutaneous transhepatic biliary drainage) | Transhepatic catheter inserted into intrahepatic bile duct (not CBD) under fluoroscopic guidance; external drainage (easy output monitoring) but risk of fluid/electrolyte losses; can be internalised later [2] | When ERCP unsuccessful or contraindicated (e.g., altered anatomy — Billroth II, Roux-en-Y; poor respiratory function) [2][3]; preferred for proximal/hilar obstruction (Klatskin tumour, RPC) where ERCP cannot access intrahepatic ducts |
| Surgical ECBD [3] | Decompression by exploration of common bile duct — open approach for emergency cases; laparoscopic approach in selected elective cases [3] | Indications: failure of endoscopic drainage; deterioration despite endoscopic drainage [3]; mortality ~30% (much higher than endoscopic/percutaneous drainage) — last resort [2] |
RAD for Cholangitis — Must Know!
Resuscitation → Antibiotics → Drainage. The key teaching point: antibiotics ALONE will fail if the obstruction is not relieved — biliary obstruction impairs antibiotic secretion into bile. If the patient has Reynolds' pentad (septic shock) or fails to improve within 24h of antibiotics → urgent biliary drainage [2][3].
In unstable patients during ERCP: aspirate bile and pus to decompress the biliary tree FIRST before injecting contrast — contrast injection into an obstructed, infected system can worsen bacteraemia [2].
| Cause | Long-Term Plan |
|---|---|
| Gallstone | ERCP stone removal (if not done acutely) + LC (early preferred over interval) [2] |
| Benign/malignant stricture | Endoscopic stent placement or definitive surgical resection [2] |
| RPC | Regular ductal clearance (USG surveillance, ERCP to remove stones/dilate strictures); resection of affected hepatobiliary segment + biliary-enteric anastomosis (e.g., hepaticojejunostomy) if atrophic liver segment, failed non-operative treatment, or suspected cholangiocarcinoma [2] |
Note: ascending cholangitis can recur even after LC because of ERCP-induced CBD dilatation or age-related CBD dilatation allowing stasis and ascending infection [2].
3.6 Gallstone Pancreatitis
Management has two phases: (1) Treat the acute pancreatitis and (2) Prevent recurrence by removing the gallbladder + addressing any CBD stone.
| Intervention | Detail | Rationale |
|---|---|---|
| NPO → early enteral nutrition | Start oral/NG feeding within 24–72h if tolerated; nasojejunal (NJ) feeding if oral not possible; TPN only if enteral route fails | Early enteral nutrition maintains gut mucosal barrier → reduces bacterial translocation → ↓ infected necrosis; TPN associated with gut atrophy and infection |
| IV fluids | Aggressive crystalloid resuscitation (goal-directed: urine output > 0.5 mL/kg/h) | Pancreatitis causes massive third-space fluid losses → hypovolaemia → pancreatic ischaemia → necrosis |
| Analgesia | NSAIDs for mild pain; opioids for severe pain; morphine should be AVOIDED (sphincter of Oddi spasm) [1] | Pethidine/fentanyl preferred if opioids needed |
| Antibiotics | Prophylactic antibiotics generally NOT recommended; may be considered if pancreatic necrosis > 30% on CT → imipenem/meropenem [1] | Target enteric organisms; antibiotics that penetrate necrosis: carbapenems, fluoroquinolones, metronidazole [1] |
| Monitoring | Vitals, I/O, serial bloods (WCC, CRP, calcium, LFT, amylase), severity scoring (Ranson, APACHE II, BISAP, CTSI) | Detect organ failure early; guide escalation to ICU |
| Scenario | Action |
|---|---|
| Concurrent cholangitis or confirmed persistent CBD stone | ERCP within 24 hours of admission — sphincterotomy + stone extraction [1] |
| CBD obstruction suspected but no cholangitis | ERCP within 24–72h if visible stone on imaging, dilated CBD, or worsening LFT [1] |
| No evidence of CBD obstruction | ERCP is NOT indicated [1]; perform LFT, MRCP, or EUS to confirm before proceeding |
| Severity | Timing |
|---|---|
| Mild pancreatitis | Cholecystectomy within the same index hospitalisation (can be performed safely within a week of recovery) [1] |
| Severe necrotizing pancreatitis | Delay cholecystectomy (interval LC) until active inflammation subsides and fluid collections resolve or stabilise [1] |
The rationale for same-admission cholecystectomy in mild disease: if you discharge the patient and bring them back later, ~30% will have a recurrent biliary event (colic, cholecystitis, recurrent pancreatitis, cholangitis) in the interval — this is an avoidable risk [1].
| Csendes Type | Management |
|---|---|
| Type I (no fistula) | Laparoscopic or open cholecystectomy [2] |
| Type II–V (with fistula) | Open surgery — subtotal cholecystectomy (severe inflammation impedes safe dissection of Calot's triangle) + CBD repair: closure of fistula / choledochoplasty / bilioenteric anastomosis (choledochojejunostomy) depending on size of defect [2] |
| Pre-operative | ERCP for biliary stenting (temporary decompression) [1] |
Why subtotal cholecystectomy? The dense inflammatory adhesions around Hartmann's pouch make full dissection of Calot's triangle extremely hazardous — attempting a complete cholecystectomy risks catastrophic CBD injury. Leaving the posterior GB wall attached to the liver bed (and removing the rest) is safer [2].
| Step | Detail | Rationale |
|---|---|---|
| Enterolithotomy | Exploratory laparotomy → identify impacted stone → make proximal enterotomy (NOT over the stone — the bowel wall overlying the stone is ulcerated and friable → high leak risk if incised there) → milk the stone proximally for extraction [2] | Relieve the mechanical SBO — this is the life-saving step |
| Cholecystectomy + fistula repair | Same-session or elective depending on patient fitness [2] | Remove the source and close the fistula to prevent recurrence |
| Phase | Management |
|---|---|
| Acute | Resuscitation + IV antibiotics + biliary drainage (ERCP is difficult for intrahepatic stones → PTBD preferred; or T-tube drainage; or hepaticocutaneojejunostomy (HCJ) = a surgical access conduit for repeated biliary interventions) [2] |
| Long-term prevention | Regular ductal clearance: USG surveillance + ERCP to remove stones and dilate strictures |
| Surgical | Resection of affected hepatobiliary segment + biliary-enteric anastomosis (e.g., hepaticojejunostomy) — indications: atrophic liver segment, failed non-operative treatment, suspected cholangiocarcinoma [2] |
| Presentation | Initial Mx | Definitive Mx |
|---|---|---|
| Asymptomatic | Watchful waiting; UDCA if cholesterol stone | Prophylactic LC only if high risk (porcelain GB, polyp ≥ 1 cm, large stones, TPN) |
| Biliary colic | NSAIDs, NPO, antiemetics | Elective LC |
| Acute cholecystitis | NPO, IVF, IV antibiotics | Early LC (within 72h); PTC if unfit; Emergency LC if complicated |
| Choledocholithiasis | Risk-stratify | ERCP + sphincterotomy + stone extraction → LC |
| Acute cholangitis | RAD: Resuscitate + Antibiotics + Drainage | ERCP (1st line drainage) → LC |
| Gallstone pancreatitis | Supportive (IVF, analgesia, NPO → early enteral feeding) | ERCP if cholangitis/CBD stone → LC same admission (mild) or interval (severe) |
| Mirizzi | ERCP stenting | LC (Type I) or open subtotal cholecystectomy + CBD repair (Type II–V) |
| Gallstone ileus | Resuscitation | Enterolithotomy → LC + fistula repair |
High Yield Summary — Management of Gallstones
- Elective LC is the definitive treatment for almost all symptomatic gallstone disease — it removes the stone factory.
- Early LC (within 72h) is the standard of care for acute cholecystitis — safe, single-admission, avoids recurrence while waiting.
- Critical View of Safety: clear Calot's triangle, expose cystic plate, see ONLY 2 structures (cystic duct + artery) → prevents bile duct injury. If CVS not achieved → IOC or convert to open.
- Tokyo severity grading guides cholecystitis management: Grade I–II → early LC; Grade III → organ support + GB drainage (PTC) → delayed LC.
- Cholecystostomy indications: high surgical risk, haemodynamically unstable, difficult cholecystectomy.
- Choledocholithiasis: risk-stratify → High = ERCP directly; Intermediate = MRCP/EUS first; Low = LC + IOC.
- RAD for cholangitis: Resuscitation → Antibiotics (cefuroxime + metronidazole or Tazocin) → Drainage (ERCP 1st line).
- QMH drainage hierarchy: ERCP → PTBD → surgical ECBD.
- ERCP complications: pancreatitis (most common), perforation (intra- vs retroperitoneal), bleeding, cholangitis.
- ERCP contraindications: altered GI anatomy (Billroth II, Roux-en-Y), bowel obstruction, severe coagulopathy.
- Gallstone pancreatitis: ERCP within 24h if concurrent cholangitis; ERCP NOT indicated if no CBD obstruction; LC same admission if mild, interval if severe.
- Morphine should be AVOIDED in biliary/pancreatic pain → sphincter of Oddi spasm. NSAIDs preferred.
- Prophylactic antibiotics NOT recommended in pancreatitis unless necrosis > 30% → carbapenems.
Active Recall - Management of Gallstones
References
[1] Senior notes: felixlai.md (Treatment of Cholelithiasis, Treatment of Choledocholithiasis, Cholecystitis treatment — Tokyo grading, GB drainage overview, ERCP complications, Acute Cholangitis treatment, Acute Pancreatitis — prevention/cholecystectomy timing, Mirizzi syndrome treatment sections) [2] Senior notes: maxim.md (Asymptomatic gallstones, Biliary colic management, Acute cholecystitis — early vs interval LC and PTC, Cholecystectomy — indications/CVS/operative details, Choledocholithiasis management, Acute cholangitis — RAD, Gallstone ileus management, Mirizzi syndrome management, RPC management sections) [3] Lecture slides: GC 200. RUQ pain, jaundice and fever Cholecytitis and cholangitis Imaging of GI system.pdf (slides on cholecystectomy — open/lap/early/delayed, cholecystostomy indications, cholangitis management — antibiotics and ERCP/ECBD)
Complications of Gallstones
Gallstones are one of those conditions where the complications are arguably more important than the disease itself. An asymptomatic stone sitting in the gallbladder is harmless — it is what happens when it moves, obstructs, inflames, or erodes that causes the full spectrum of surgical pathology. The complications are best understood by thinking about where the stone is and what it is doing to the surrounding structures.
The lecture slides provide a clean list of gallstone complications [3]:
Complications of gallstone disease [3]:
- Mucocele of gallbladder
- Empyema of gallbladder
- Rupture of gallbladder
- Acute cholangitis
- Acute pancreatitis
- Cholecystoduodenal fistula
- Liver abscess
Building on this, we can organise all complications into three anatomical categories [1][2]:
Additionally, there are complications of cholecystectomy itself — which are just as examinable [2].
2. Complications in the Gallbladder
Pathology: Acute inflammation of gallbladder → Obstruction of cystic duct → Complication of gallstone disease → Chemical inflammation → bacterial infection [3].
This is the most common complication of symptomatic gallstones. The pathophysiology was covered in detail in the Clinical Features section: prolonged cystic duct obstruction → bile concentration → chemical inflammation (first 48h) → secondary bacterial infection (E. coli, Klebsiella, Strep. faecalis) [2]. The key concept is that acute cholecystitis is the gateway to a cascade of progressively more dangerous complications if left untreated.
Mechanism: Prolonged impaction of a stone in the cystic duct without active cholecystitis → bile within the gallbladder gets absorbed (since no fresh bile can enter) → but the gallbladder epithelium continues to secrete mucus → the gallbladder becomes distended with colourless, mucoid fluid (not bile) = "white bile" [1].
| Feature | Detail | Pathophysiological Basis |
|---|---|---|
| Palpable gallbladder | May be palpable on examination | GB distended with mucus |
| Usually non-tender | No active inflammation (unlike cholecystitis) | Cystic duct obstruction without bacterial infection or chemical irritation |
| Complications | Can progress to oedema of GB wall, secondary infection, inflammation, and perforation [1] | Chronic distension compromises mural blood flow → ischaemia → predisposes to bacterial superinfection |
| Management | Early cholecystectomy is generally indicated to avoid complications [1] | Even though it may persist with few consequences, the risk of progression justifies removal |
The distinction from acute cholecystitis is important: mucocele = distended but non-inflamed, non-tender GB; cholecystitis = distended, inflamed, tender GB with systemic signs.
Mechanism: Acute cholecystitis with persistent cystic duct obstruction → secondary bacterial infection becomes fulminant → pus fills the gallbladder (empyema = "pus within a cavity"). This is essentially an intracystic abscess.
| Feature | Detail | Pathophysiological Basis |
|---|---|---|
| Clinical presentation | Tender RUQ mass + septic-looking patient [2]; high swinging fever, rigors, marked leucocytosis | Walled-off collection of pus under pressure → systemic sepsis |
| Distinction from simple cholecystitis | Much more toxic-appearing; GB is palpable as a tense, exquisitely tender mass | Pus under pressure within a closed space; GB wall is stretched and inflamed beyond simple cholecystitis |
| Risk | Can progress to gangrene, perforation, or biliary sepsis | Ongoing bacterial proliferation with compromised mural blood supply |
| Management | Urgent intervention: emergency LC or percutaneous cholecystostomy if unfit for surgery [1] | Must decompress the infected collection |
Mechanism: Continued distension of the gallbladder → increased intraluminal pressure exceeds mural perfusion pressure → ischaemic necrosis of the gallbladder wall (gangrene). This is the MOST common complication of cholecystitis [1], occurring in approximately 20% of cases [2].
| Feature | Detail | Pathophysiological Basis |
|---|---|---|
| Clinical clue | Presence of a sepsis-like picture suggests the diagnosis [1]; paradoxically, patient may report decreased RUQ pain | Nerve endings in the GB wall are destroyed by necrosis → pain may transiently decrease even as the patient becomes more systemically unwell |
| Lab findings | Markedly elevated WCC ( > 18,000), CRP; blood cultures may be positive | Full-thickness necrosis → bacterial invasion of wall → bacteraemia |
| Imaging | CT: irregular/absent GB wall enhancement; intraluminal membranes; pericholecystic abscess | Non-enhancing areas of wall = necrotic tissue (no blood supply to take up contrast) |
| Management | Emergency cholecystectomy — gangrenous GB will not resolve with antibiotics alone [2] | Necrotic tissue cannot be sterilised; only removal prevents perforation |
Beware the 'Improving' Patient
A patient with acute cholecystitis whose pain suddenly decreases but whose systemic status worsens (↑ tachycardia, ↑ fever, ↑ WCC) may have developed gangrenous cholecystitis — the pain improves because the nerves in the GB wall are dead. This is a surgical emergency, not an improvement.
Mechanism: Secondary infection of the gallbladder wall with gas-forming organisms — most commonly Clostridium perfringens (welchii) — producing gas within the GB wall and lumen [1][2].
| Feature | Detail | Pathophysiological Basis |
|---|---|---|
| Clinical presentation | Insidious onset; abdominal crepitus adjacent to the gallbladder [1][2] | Gas produced by Clostridia dissects through tissue planes |
| Labs | Unconjugated hyperbilirubinaemia may be present [1] | Clostridial infection produces toxins that cause haemolysis → ↑ unconjugated bilirubin from RBC destruction [1] |
| Imaging | CT/AXR: gas within GB wall and/or lumen — pathognomonic | Gas produced by bacterial fermentation |
| Risk factors | Elderly males, diabetics (impaired immunity + microvascular disease → GB ischaemia) | DM → microangiopathy → ischaemic GB wall → anaerobic bacteria thrive in necrotic tissue |
| Management | Emergency cholecystectomy — high mortality if untreated [2] | Gas gangrene progresses rapidly; antibiotics alone cannot penetrate gas-filled necrotic tissue |
Mechanism: Occurs after development of gangrene → perforation in ischaemic areas of the GB wall [1]. The outcome depends on whether the perforation is contained or free.
| Type | Detail | Pathophysiological Basis |
|---|---|---|
| Contained (most common) | Perforation is walled off by the omentum and adjacent organs → localised pericholecystic abscess or intrahepatic abscess [1] | The greater omentum ("policeman of the abdomen") migrates to seal off the perforation site |
| Free perforation | Rare (omentum usually prevents this) → generalised biliary peritonitis | Bile is a chemical irritant and contains bacteria → diffuse peritoneal inflammation → septic shock |
| Perforation into adjacent organ | GB wall erodes into duodenum, colon, or stomach → cholecystoenteric fistula [1] | Long-standing pressure necrosis from an impacted stone rather than acute inflammation [1] |
| Management | Emergency surgery: contained → drainage + cholecystectomy; free → laparotomy, washout, cholecystectomy; fistula → see gallstone ileus section | Uncontained bile peritonitis is rapidly fatal without surgery |
Chronic cholecystitis itself is a complication of recurrent gallstone disease (repeated episodes of acute cholecystitis or persistent mechanical irritation → fibrosis and thickening of GB wall) [2]. It then predisposes to further complications:
| Complication | Mechanism |
|---|---|
| Porcelain gallbladder | Chronic inflammation → extensive scarring → dystrophic calcification of GB wall [2]; 2–3% risk of malignancy → absolute indication for cholecystectomy even if asymptomatic [1][2] |
| CA Gallbladder | Chronic inflammation → dysplasia → carcinoma sequence; 95% of patients with GB carcinoma have gallstones [1]; chronic cholecystitis is the single strongest risk factor |
| Typhoid carrier state | Salmonella typhi colonises the chronically inflamed gallbladder → chronic biliary carriage [2]; cholecystectomy may be needed to eradicate carriage |
3. Complications in the Bile Duct
Stone migrates from GB through cystic duct into CBD → obstructive jaundice, cholestatic LFT. This is a complication in itself but also the gateway to the three major duct complications below [1].
The most common complication of CBD stones (along with gallstone pancreatitis) [1]. Biliary obstruction + stasis → bacterial infection of the biliary tract. Covered in detail in previous sections.
| Severity | Clinical Correlate |
|---|---|
| Mild-moderate | Charcot's triad (fever, jaundice, RUQ pain) — responds to antibiotics |
| Severe / Suppurative | Reynolds' pentad (Charcot's triad + hypotension + altered mental status) → biliary sepsis → septic shock → multi-organ failure if not drained urgently [1][2] |
Key concept: 15% of patients will NOT respond to antibiotics alone and require emergency biliary decompression [1] — because the obstruction prevents antibiotics from being secreted into bile.
3.3 Acute Pancreatitis [3]
Gallstones are the most common cause of acute pancreatitis (55%) [4]. Mechanism: stone impacts at the ampulla of Vater → reflux of bile into the pancreatic duct → premature activation of trypsinogen → autodigestion of pancreas → release of inflammatory mediators (SIRS) [2].
The complications of pancreatitis itself are extensive and deserve detailed coverage:
| Complication | Time | Mechanism | Management |
|---|---|---|---|
| Acute peripancreatic fluid collection | < 4 weeks | Inflammatory exudate around the pancreas, no defined wall | Usually self-resolves; no intervention unless infected |
| Pancreatic pseudocyst | ≥ 4 weeks | Encapsulated collection of pancreatic juice/debris with a well-defined fibrous wall but NO epithelial lining (hence "pseudo-") | Observe if small and asymptomatic; drain if symptomatic ( > 6 cm), infected, or compressing adjacent structures — endoscopic (EUS-guided cystogastrostomy), percutaneous, or surgical drainage |
| Acute necrotic collection | < 4 weeks | Areas of non-viable pancreatic or peripancreatic tissue ± fluid, no mature wall | Usually managed conservatively; intervene if infected |
| Walled-off necrosis | ≥ 4 weeks | Maturation of necrotic collection into an encapsulated mixed solid-liquid mass | If infected → step-up approach: percutaneous/endoscopic drainage → if fails, minimally invasive necrosectomy → open necrosectomy as last resort |
| Infected necrosis | Usually > 2 weeks | Bacterial translocation from the gut into necrotic tissue | Suspect if clinical deterioration after initial improvement, gas bubbles within necrosis on CT → antibiotics (carbapenems) + drainage/necrosectomy |
| Complication | Mechanism |
|---|---|
| SIRS / Sepsis | Massive cytokine release (TNF-α, IL-1, IL-6) from pancreatic and peripancreatic necrosis → systemic inflammatory response |
| Organ failure | Respiratory (ARDS — inflammatory mediators → ↑ alveolar-capillary permeability + pleural effusions from diaphragmatic inflammation); Renal (pre-renal AKI from hypovolaemia + direct cytokine-mediated tubular injury); Cardiovascular (distributive shock from SIRS) |
| Hypocalcaemia / Tetany | Fat saponification: lipase → fat necrosis → release of fatty acids → precipitate with calcium → ↓ serum calcium → Chvostek's/Trousseau's sign [2] |
| Hyperglycaemia | Destruction of islets of Langerhans (β-cells) → insulin deficiency |
| Cullen's sign / Grey Turner's sign | Retroperitoneal haemorrhage tracking along tissue planes: periumbilical (Cullen's) and flanks (Grey Turner's) [2] |
| Splenic vein thrombosis | Inflammation of pancreatic tail adjacent to splenic vein → thrombosis → left-sided portal hypertension → gastric varices |
| Pseudoaneurysm | Pancreatic enzymes erode into adjacent arteries (splenic, gastroduodenal, pancreaticoduodenal) → severe and fatal haemorrhage [1] |
Pseudoaneurysm — A Hidden Killer
Suspect pseudoaneurysm if a patient with pancreatitis develops sudden haemorrhagic shock or haematemesis. Severe and fatal haemorrhage can occur following endoscopic drainage in patients with an unsuspected pseudoaneurysm [1]. Always perform CT angiography before draining pancreatic collections to rule this out. Treatment is angiographic embolisation or surgery.
Stone impacted in Hartmann's pouch/cystic duct → extrinsic compression of the common hepatic duct → obstructive jaundice. Chronic inflammation → erosion of bile duct wall → cholecystobiliary fistula (Csendes Types II–V) [1][2]. Long-term: association with CA gallbladder due to recurrent inflammation and biliary stasis [2].
4. Complications from Perforation / Erosion to Other Sites
Mechanism: Chronic cholecystitis → GB wall erodes through into adjacent bowel (usually duodenum) via a cholecystoenteric fistula → large stone ( > 2.5 cm) passes into the bowel → impacts at the narrowest point of the small bowel (terminal ileum, ~2 feet proximal to the ileocaecal valve) → mechanical small bowel obstruction [2].
"Cholecystoduodenal fistula" [3] is the term used on the lecture slides.
| Fistula Type | Consequence |
|---|---|
| Cholecystoduodenal (most common) | Symptomatic gallstone ileus — distal SBO [2] |
| Cholecystocolic | Usually asymptomatic (large bowel has a wider lumen) [2] |
| Cholecystogastric | Rare; gastric outlet obstruction |
Bouveret's syndrome: Stone impacts in the duodenum or stomach, causing gastric outlet obstruction (GOO) rather than SBO [2].
Diagnostic triad on AXR/CT — Rigler's triad [2]:
- Pneumobilia (air in biliary tree — through the fistula)
- Small bowel obstruction
- Ectopic gallstone (usually in RIF at ileocaecal valve)
Mechanism: Two routes:
- Direct extension: GB perforation (contained) → pericholecystic abscess extends into liver parenchyma → intrahepatic abscess [1].
- Ascending cholangitis: CBD obstruction → biliary sepsis → ascending infection into intrahepatic ducts → pyogenic liver abscess.
| Feature | Detail |
|---|---|
| Presentation | Swinging fever, RUQ pain, tender hepatomegaly; may mimic cholangitis |
| Imaging | USG/CT: hypoechoic/hypodense intrahepatic collection |
| Management | Percutaneous drainage + IV antibiotics; treat underlying cause (cholecystectomy, CBD clearance) |
5. Complications of Cholecystectomy
These are complications of the treatment of gallstones and are highly examinable [2]:
| Complication | Detail | Pathophysiological Basis |
|---|---|---|
| Conversion to open surgery | 5% in elective cases, 25% in emergency cases — NOT a failure [2] | Dense adhesions, unclear anatomy, uncontrolled bleeding, or inability to achieve CVS |
| GA risks | Aspiration, cardiovascular events, anaphylaxis | General anaesthesia-related |
| Bleeding | From liver bed (middle hepatic vein close to GB fossa), cystic artery, trocar sites [2] | Venous bleeding from liver bed is the most common |
| Damage to neighbouring structures | Bile leakage (biliary tree), bleeding (cystic artery), pneumoperitoneum-related injury (duodenum, transverse colon, hepatic flexure) [2] | Thermal/mechanical injury during dissection, trocar insertion injuries |
| Complication | Detail | Pathophysiological Basis |
|---|---|---|
| Biliary leakage | From cystic duct stump or duct of Luschka; incidence ~0.5% [2] | Cystic duct clip slippage or necrosis of duct stump; duct of Luschka = small accessory bile ductule in the GB fossa draining directly into the liver bed, often injured during GB dissection |
| If noted intra-op: repair + T-tube placement [2] | ||
| Delayed presentation (post-op D2–10): fever, RUQ pain, deranged LFT; Ix: USG/CT → HIDA scan/MRCP; Mx: ERCP stent (minor leak) or laparotomy + lavage + Roux-en-Y hepaticojejunostomy (major leak) [2] | Bile is a chemical and bacterial irritant → bile peritonitis if not contained | |
| Post-op jaundice | Dropped or missed CBD stones [2] | Stones dislodged during manipulation → fall into CBD → obstruction |
| Post-op cholangitis | Infected residual stone | Obstruction + bacteria |
| Post-op diarrhoea | Initial uncoordinated excessive bile salt excretion + fat malabsorption [2] | Loss of GB reservoir → continuous bile flow into duodenum → excess bile salts reach colon → stimulate colonic secretion (bile salt diarrhoea); resolves in weeks as the body adapts |
| Bleeding | Liver bed, cystic artery, trocar sites [2] | May present as haemodynamic instability or drain output |
| Complication | Detail | Pathophysiological Basis |
|---|---|---|
| Bile duct stricture | Most feared long-term complication; Mx: reconstruction ± hepaticojejunostomy [2] | Thermal injury, clip placement on CBD (misidentified as cystic duct), ischaemic injury → fibrosis → stricture — this is why CVS is so critical |
| Subphrenic abscess | Collection in the subphrenic/subhepatic space; Mx: drainage + antibiotics [2] | Residual bile/blood in the operative field becomes infected |
| Post-cholecystectomy syndrome | Persistent symptoms (e.g., biliary colic, diarrhoea) after operation [2] | Causes: residual CBD stone, bile duct stricture, sphincter of Oddi dysfunction, bile salt diarrhoea, or non-biliary cause (PUD, IBS) that was the true cause of symptoms all along |
| Post-cholecystectomy choledocholithiasis | CBD stones forming after cholecystectomy [2] | Bile stasis due to increased CBD calibre — loss of GB storage function → CBD dilates to compensate → stasis predisposes to stone formation [2] |
Post-Cholecystectomy Syndrome
If a patient returns with RUQ pain after cholecystectomy, don't just dismiss it. Investigate systematically:
- Retained/new CBD stone — check LFT, USG for dilated CBD, MRCP
- Bile duct stricture — MRCP/ERCP
- Bile leak — HIDA scan, USG for collection
- Sphincter of Oddi dysfunction — manometry
- Non-biliary cause — was the original diagnosis correct? Consider PUD (OGD), IBS, chronic pancreatitis
The most common cause of post-cholecystectomy syndrome is actually a non-biliary condition that was present before surgery and not addressed [2].
Because RPC (Recurrent Pyogenic Cholangitis) is particularly relevant to Hong Kong, its complications deserve separate mention [2]:
| Complication | Mechanism |
|---|---|
| Recurrent biliary sepsis | Ongoing cycle of stasis → infection → stones → more stasis [2] |
| Liver abscess | Direct extension of intrahepatic infection |
| Pancreatitis | Stones migrating to ampulla |
| Cirrhosis | Chronic biliary obstruction → secondary biliary cirrhosis [2] |
| Cholangiocarcinoma | Chronic inflammation → malignant transformation of biliary epithelium — mandates long-term surveillance [2] |
| Site | Complication | Key Feature / Mechanism |
|---|---|---|
| Gallbladder | Mucocele | Mucus-filled distended GB, "white bile", non-tender |
| Empyema | Pus-filled GB, septic patient, tender mass | |
| Gangrenous cholecystitis (most common Cx of cholecystitis) | Ischaemic necrosis of wall, paradoxical ↓ pain | |
| Emphysematous cholecystitis | Gas-forming organisms (C. perfringens), gas in wall, crepitus, haemolysis | |
| Perforation | Contained (abscess) or free (biliary peritonitis) | |
| Porcelain GB | Calcified wall, 2–3% cancer risk, absolute indication for LC | |
| CA Gallbladder | 95% have gallstones, chronic inflammation → dysplasia → carcinoma | |
| Bile Duct | Choledocholithiasis | Obstructive jaundice, cholestatic LFT |
| Acute cholangitis | Obstruction + infection; Charcot's triad / Reynolds' pentad | |
| Gallstone pancreatitis | Stone at ampulla → reflux → autodigestion; most common cause of pancreatitis | |
| Mirizzi syndrome | CHD compression by Hartmann's pouch stone; cholecystobiliary fistula | |
| Other Sites | Cholecystoduodenal fistula → gallstone ileus | SBO; Rigler's triad (pneumobilia, SBO, ectopic stone) |
| Liver abscess | Direct extension or ascending cholangitis | |
| Post-LC | Bile duct injury / stricture | Most feared; prevented by CVS |
| Biliary leakage | Cystic duct stump or duct of Luschka | |
| Post-cholecystectomy syndrome | Persistent symptoms; investigate for retained stone, stricture, SOD, non-biliary cause |
High Yield Summary — Complications of Gallstones
- Gangrenous cholecystitis is the MOST common complication of acute cholecystitis (~20%); suspect when sepsis picture worsens but pain paradoxically decreases (nerve necrosis).
- Emphysematous cholecystitis: gas-forming organisms (C. perfringens); gas in GB wall on CT; may cause unconjugated hyperbilirubinaemia from haemolysis; emergency LC.
- Mucocele: prolonged cystic duct obstruction without inflammation → "white bile"; GB is palpable but non-tender.
- Empyema: pus-filled GB; tender RUQ mass + septic patient.
- Perforation: usually contained by omentum → pericholecystic abscess; free perforation → biliary peritonitis (surgical emergency).
- Cholecystoenteric fistula → gallstone ileus: Rigler's triad = pneumobilia + SBO + ectopic stone; stone impacts at terminal ileum; Bouveret's = GOO.
- Porcelain GB: calcified GB wall → 2–3% malignancy risk → absolute indication for cholecystectomy.
- CA gallbladder: 95% have gallstones; chronic inflammation → dysplasia → carcinoma; very poor prognosis (5-year OS < 5%).
- Cholangitis complications: biliary sepsis → Reynolds' pentad → multi-organ failure if not drained.
- Pancreatitis complications: pseudocyst, infected necrosis, pseudoaneurysm, hypocalcaemia (fat saponification), ARDS, splenic vein thrombosis.
- Complications of LC: biliary leakage (cystic duct stump / duct of Luschka), bile duct injury/stricture (most feared — prevented by CVS), post-cholecystectomy syndrome.
- RPC complications: biliary sepsis, liver abscess, cirrhosis (chronic obstruction), cholangiocarcinoma (chronic inflammation).
Active Recall - Complications of Gallstones
References
[1] Senior notes: felixlai.md (Complications of gallstones, Complications of cholecystitis — gangrenous/emphysematous/perforation/cholecystoenteric fistula, Mucocele, Mirizzi syndrome, RPC, Acute pancreatitis complications — pseudoaneurysm, Gallbladder cancer) [2] Senior notes: maxim.md (Acute cholecystitis complications — empyema/gangrene/perforation/emphysematous/gallstone ileus, Chronic cholecystitis — porcelain GB/CA GB, Mirizzi syndrome, Gallstone ileus — Rigler's triad, RPC complications, Cholecystectomy specific complications — immediate/early/late, Acute pancreatitis — Cullen's/Grey Turner's/hypocalcaemia, Post-cholecystectomy syndrome) [3] Lecture slides: GC 200. RUQ pain, jaundice and fever Cholecytitis and cholangitis Imaging of GI system.pdf (Complications of gallstone disease slide; Acute cholecystitis pathology slide) [4] Lecture slides: Acute pancreatitis.pdf
High Yield Summary
- Gallstones are classified by composition: Cholesterol (85%, radiolucent), Black pigment (haemolysis, radiopaque), Brown pigment (infection/parasites, radiopaque, form in ducts).
- 5Fs: Fat, Female, Forty, Fertile, Family — risk factors for cholesterol stones.
- 80% of gallstones are asymptomatic; 3%/year become symptomatic.
- Biliary colic = steady (NOT colicky) RUQ pain < 6h after fatty meal, no fever, no jaundice, self-resolving.
- Acute cholecystitis = pain > 6h + fever + Murphy's sign; 5 USG cardinal signs (gallstones, distended GB, wall thickening > 3mm, pericholecystic fluid, sonographic Murphy's sign).
- Choledocholithiasis = obstructive jaundice + cholestatic LFT + dilated CBD on USG.
- Charcot's triad (Fever + Jaundice + RUQ pain) = acute cholangitis; Reynolds' pentad adds hypotension + AMS = suppurative cholangitis / septic shock.
- Gallstone pancreatitis = most common cause of acute pancreatitis (55%); epigastric pain radiating to back.
- Courvoisier's Law: Painless jaundice + palpable GB = unlikely gallstones (think periampullary tumour).
- Mirizzi syndrome: CHD obstruction by stone in Hartmann's pouch; Csendes classification (Types I–V).
- Gallstone ileus: Rigler's triad = pneumobilia + SBO + ectopic gallstone.
- RPC ("Hong Kong disease"): Brown pigment stones forming de novo in intrahepatic ducts (usually left); parasites → β-glucuronidase → unconjugated bilirubin → calcium bilirubinate stones.
- Porcelain gallbladder = absolute indication for cholecystectomy (risk of GB carcinoma).
High Yield DDx Summary for Exams
When asked "DDx of gallstones", think systematically:
-
Differentiate within gallstone complications first: biliary colic vs cholecystitis vs choledocholithiasis vs cholangitis vs pancreatitis vs Mirizzi vs gallstone ileus — use pain duration, fever, jaundice, Murphy's sign, and labs.
-
Then differentiate from non-gallstone mimics based on the presenting complaint:
- RUQ pain: PUD, hepatitis, liver abscess, appendicitis, RLL pneumonia, inferior MI, renal colic
- Obstructive jaundice: CA head of pancreas (Courvoisier +), cholangiocarcinoma, PSC, Mirizzi, choledochal cyst
- Cholangitis: RPC, liver abscess, infected choledochal cyst, biliary leak
- Pancreatitis: GAME ID (Gallstones, Alcohol, Metabolic, ERCP, Idiopathic, Drugs)
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Imaging first-line: USG/CT to determine duct size, level of obstruction, cause, and associated features [5].
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Courvoisier's Law helps distinguish stone from tumour: palpable GB + painless jaundice = tumour until proven otherwise.
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Polyp vs stone on USG: polyp = fixed, no shadow; stone = gravity-dependent, posterior acoustic shadow.
High Yield Summary — Diagnosis of Gallstones
- Biliary colic = clinical diagnosis; USG confirms stones + normal GB wall + no systemic inflammation.
- Acute cholecystitis = Tokyo criteria: 1 local sign + 1 systemic sign = suspected; + imaging = definite. 5 cardinal USG signs are the imaging gold standard.
- HIDA scan = second-line when USG is inconclusive; non-visualisation of GB = cystic duct obstruction = cholecystitis.
- Acute cholangitis = TG18 criteria: systemic inflammation + cholestasis = suspected; + biliary dilatation with identified cause on imaging = definite. Severity grading dictates urgency of biliary drainage.
- Choledocholithiasis = risk-stratify: High → ERCP directly; Intermediate → MRCP/EUS first; Low → LC + IOC.
- USG is first-line for all gallstone presentations. It is limited for distal CBD stones (bowel gas).
- MRCP has replaced diagnostic ERCP — use MRCP to confirm, ERCP to treat.
- ERCP is reserved for high-risk CBD stones and urgent biliary drainage — it is invasive with significant complication risk (pancreatitis 3–10%).
- CT is best for complications (emphysematous cholecystitis, perforation, pancreatitis necrosis, staging malignancy) and is NOT the first choice for detecting gallstones (only 75% sensitivity).
- LFT evolution: Early obstruction → ↑ AST/ALT; Later → ↑ ALP/GGT (cholestatic pattern). Always repeat LFT in 24–48h.
- Always send blood cultures in suspected cholangitis BEFORE antibiotics.
- Always do ECG + erect CXR to exclude MI and RLL pneumonia as RUQ pain mimics.
High Yield Summary — Management of Gallstones
- Elective LC is the definitive treatment for almost all symptomatic gallstone disease — it removes the stone factory.
- Early LC (within 72h) is the standard of care for acute cholecystitis — safe, single-admission, avoids recurrence while waiting.
- Critical View of Safety: clear Calot's triangle, expose cystic plate, see ONLY 2 structures (cystic duct + artery) → prevents bile duct injury. If CVS not achieved → IOC or convert to open.
- Tokyo severity grading guides cholecystitis management: Grade I–II → early LC; Grade III → organ support + GB drainage (PTC) → delayed LC.
- Cholecystostomy indications: high surgical risk, haemodynamically unstable, difficult cholecystectomy.
- Choledocholithiasis: risk-stratify → High = ERCP directly; Intermediate = MRCP/EUS first; Low = LC + IOC.
- RAD for cholangitis: Resuscitation → Antibiotics (cefuroxime + metronidazole or Tazocin) → Drainage (ERCP 1st line).
- QMH drainage hierarchy: ERCP → PTBD → surgical ECBD.
- ERCP complications: pancreatitis (most common), perforation (intra- vs retroperitoneal), bleeding, cholangitis.
- ERCP contraindications: altered GI anatomy (Billroth II, Roux-en-Y), bowel obstruction, severe coagulopathy.
- Gallstone pancreatitis: ERCP within 24h if concurrent cholangitis; ERCP NOT indicated if no CBD obstruction; LC same admission if mild, interval if severe.
- Morphine should be AVOIDED in biliary/pancreatic pain → sphincter of Oddi spasm. NSAIDs preferred.
- Prophylactic antibiotics NOT recommended in pancreatitis unless necrosis > 30% → carbapenems.
High Yield Summary — Complications of Gallstones
- Gangrenous cholecystitis is the MOST common complication of acute cholecystitis (~20%); suspect when sepsis picture worsens but pain paradoxically decreases (nerve necrosis).
- Emphysematous cholecystitis: gas-forming organisms (C. perfringens); gas in GB wall on CT; may cause unconjugated hyperbilirubinaemia from haemolysis; emergency LC.
- Mucocele: prolonged cystic duct obstruction without inflammation → "white bile"; GB is palpable but non-tender.
- Empyema: pus-filled GB; tender RUQ mass + septic patient.
- Perforation: usually contained by omentum → pericholecystic abscess; free perforation → biliary peritonitis (surgical emergency).
- Cholecystoenteric fistula → gallstone ileus: Rigler's triad = pneumobilia + SBO + ectopic stone; stone impacts at terminal ileum; Bouveret's = GOO.
- Porcelain GB: calcified GB wall → 2–3% malignancy risk → absolute indication for cholecystectomy.
- CA gallbladder: 95% have gallstones; chronic inflammation → dysplasia → carcinoma; very poor prognosis (5-year OS < 5%).
- Cholangitis complications: biliary sepsis → Reynolds' pentad → multi-organ failure if not drained.
- Pancreatitis complications: pseudocyst, infected necrosis, pseudoaneurysm, hypocalcaemia (fat saponification), ARDS, splenic vein thrombosis.
- Complications of LC: biliary leakage (cystic duct stump / duct of Luschka), bile duct injury/stricture (most feared — prevented by CVS), post-cholecystectomy syndrome.
- RPC complications: biliary sepsis, liver abscess, cirrhosis (chronic obstruction), cholangiocarcinoma (chronic inflammation).
Gallbladder Cancer
Gallbladder cancer is a rare, aggressive malignancy arising most commonly from the glandular epithelium of the gallbladder wall, often associated with gallstones and typically presenting at an advanced stage due to its insidious clinical course.
Hepatocellular Carcinoma
Hepatocellular carcinoma is a primary malignant neoplasm of the liver arising from hepatocytes, most commonly occurring in the setting of chronic liver disease and cirrhosis.