GC193 Inguinal And Scrotal Swelling Different Types Of Hernia
Inguinal and scrotal swellings encompass various hernia types—indirect inguinal (through the deep ring), direct inguinal (through the posterior wall of the inguinal canal), and femoral (through the femoral canal)—as well as non-hernia causes such as hydrocele, varicocele, and undescended testis, each distinguished by anatomical location and clinical characteristics.
Inguinal & Scrotal Swelling — Different Types of Hernia
Big Idea: This lecture, delivered by Dr. Jeremy Yip, is a comprehensive surgical overview of groin and scrotal pathology — from anatomy of the inguinal canal, through differential diagnosis of groin/scrotal lumps, to the classification, examination, and surgical management of inguinal and femoral hernias, and scrotal conditions (hydrocele, varicocele, testicular torsion, testicular tumours). It is a classic "lump" lecture — the examiner wants you to be able to systematically evaluate any groin or scrotal swelling, distinguish hernia types, know when and how to operate, and understand complications. [1]
Learning Objectives (inferred from slides):
- Enumerate the differential diagnosis of painful and painless groin and scrotal swellings
- Describe the anatomy of the inguinal canal, myopectineal orifice, and femoral canal
- Differentiate indirect from direct inguinal hernia and femoral hernia clinically and anatomically
- Know the special hernia types (pantaloon, sliding, Richter's, Amyand's, Littre's, Maydl's)
- Perform a systematic hernia examination (standing → supine, cough impulse, occlusion test, pubic tubercle)
- Outline the management algorithm: watchful waiting vs. surgery (herniotomy/herniorrhaphy/hernioplasty)
- Compare open (Lichtenstein, Shouldice) vs. laparoscopic (TEP, TAPP) repair
- Understand chronic postoperative inguinal pain (CPIP)
- Manage recurrent hernia (switch approach)
- Assess and manage scrotal pathology: hydrocele, varicocele, testicular torsion, testicular tumour
Lecture Case Vignettes
The lecture opens with four clinical scenarios that map to the major diagnostic categories: [1]
- 50/F — left groin painful swelling with abdominal distension and vomiting (AXR: dilated bowel loops) → strangulated femoral hernia with bowel obstruction
- 30/M bodybuilder — right groin pain when doing squats → inguinal hernia (acquired, raised intra-abdominal pressure)
- 70/M — painless left groin bulge → inguinal hernia (direct, elderly)
- 28/M — infertility and left scrotal swelling → varicocele
Core Anatomy
The inguinal canal is an oblique passage through the lower abdominal wall. In males it transmits the spermatic cord and ilioinguinal nerve; in females the round ligament and ilioinguinal nerve. [1]
| Wall | Structure | Mnemonic |
|---|---|---|
| Anterior (Superficial) | External oblique aponeurosis | "Skin side = External" |
| Posterior (Deep) | Transversalis fascia + Conjoint tendon (medially) | Most important — this is what fails in direct hernia |
| Superior (Roof) | Internal oblique + Transversus abdominis (arching fibres) | |
| Inferior (Floor) | Inguinal ligament (Poupart's ligament) | Rolled-under edge of external oblique aponeurosis |
Why this matters: Direct hernias push through the posterior wall (transversalis fascia weakness). Indirect hernias enter through the deep inguinal ring (a defect in the transversalis fascia laterally). Understanding walls = understanding hernia types. [1]
The spermatic cord contains: vas deferens, artery to the vas, gonadal artery, cremasteric artery and vein, gonadal vein (pampiniform plexus), genital branch of genitofemoral nerve, ilioinguinal nerve, sympathetic nerves, lymphatics. The coverings are: internal spermatic fascia, cremasteric fascia and muscle, external spermatic fascia. [1]
Male: opening in the transversalis fascia through which the vas deferens enters on its course from the pelvis. Female: transmits the round ligament and the genital branch of the genitofemoral nerve. [1]
Surface marking: The deep inguinal ring lies at the midpoint of the inguinal ligament (midpoint between ASIS and pubic tubercle). This is different from the mid-inguinal point (midpoint between ASIS and pubic symphysis), which marks the femoral artery pulse. Confusing these is one of the most common exam mistakes. [1]
Critical Distinction
- Midpoint of inguinal ligament = ASIS to Pubic Tubercle → marks the deep inguinal ring
- Mid-inguinal point = ASIS to Pubic Symphysis → marks the femoral artery pulse
These are NOT the same point! The pubic tubercle is lateral to the pubic symphysis, so the midpoint of the inguinal ligament is slightly more lateral than the mid-inguinal point.
First described by Henri Fruchaud in 1956. An area of weakness in the pelvic region not reinforced by muscle layers. All groin hernias (inguinal and femoral) emerge through this single orifice. Prone to progressive bulging from repetitive increases in intra-abdominal pressure. [1]
Borders of the MPO:
- Superior: Arching fibres of internal oblique and transversus abdominis
- Medial: Rectus abdominis and its fascial sheath
- Inferior: Cooper's (pectineal) ligament
- Lateral: Iliopsoas muscle
Why this matters clinically: The laparoscopic posterior approach (TEP/TAPP) repairs the entire MPO with a single mesh — covering both potential inguinal AND femoral defects. This is why laparoscopic repair is recommended for females (to avoid missing a femoral hernia) and for bilateral hernias (one operation, both sides). [1]
Triangle of Doom: bounded by vas deferens (medially) and gonadal vessels (laterally) — contains external iliac vessels. Triangle of Pain: lateral to the gonadal vessels — contains lateral femoral cutaneous nerve, femoral branch of genitofemoral nerve, and femoral nerve. [1]
These are danger zones during laparoscopic hernia repair. Tacking or stapling in the Triangle of Doom → vascular injury. Tacking in the Triangle of Pain → chronic neuropathic pain. [1]
Differential Diagnosis of Groin and Scrotal Swellings
Painful groin lumps: tender lymph nodes, strangulated inguinal hernia, strangulated femoral hernia. Painless groin lumps: skin swelling, non-tender lymph nodes, inguinal hernia, femoral hernia, undescended testis, femoral artery aneurysm, saphena varix. [1]
Painful scrotal lumps: torsion of testis, torsion of appendage, epididymo-orchitis, strangulated inguinal hernia, haematocele/haematoma. Painless scrotal lumps: inguinal hernia, hydrocele, epididymal cyst, spermatocele, varicocele, testicular tumour, skin swelling. [1]
| Feature | Hernia | Hydrocele | Epididymal cyst | Varicocele | Testicular tumour |
|---|---|---|---|---|---|
| Get above it? | No (inguinoscrotal) | Yes | Yes | Yes | Yes |
| Transillumination | No | Yes | Yes | No | No |
| Cough impulse | Yes | No (unless communicating) | No | No | No |
| Separate from testis? | No | No (testis within) | Yes (posterior/superior) | Yes | No |
| Tenderness | Only if strangulated | Usually no | No | Mild ache | Usually painless |
| Consistency | Soft, fluctuant | Tense/smooth | Smooth, cystic | "Bag of worms" | Firm, hard |
| Reducible | Yes (unless incarcerated) | No | No | Decompresses on lying | No |
Inguinal Hernia — Classification and Types
Indirect hernia: lateral to the inferior epigastric vessels, due to recannulation of the obliterated vaginal process (processus vaginalis). Direct hernia: medial to the inferior epigastric vessels, due to insufficient transversalis fascia. Pantaloon hernia: presence of both direct and indirect hernia. Sliding hernia: an internal organ forming part of the hernia wall, usually the sigmoid colon. [1]
| Feature | Indirect | Direct |
|---|---|---|
| Relation to inferior epigastric vessels | Lateral | Medial |
| Enters through | Deep ring → entire canal → may reach scrotum | Hesselbach's triangle → medial 1/3 of canal |
| Descends into scrotum? | Yes (can) | Rarely |
| Age/demographics | Younger males (congenital); can also be acquired in elderly | Older males (acquired) |
| Aetiology | Patent processus vaginalis (congenital) or acquired | Weakened posterior wall (transversalis fascia) |
What the paired hernia diagrams show: indirect — peritoneal sac entering the deep inguinal ring lateral to the inferior epigastrics and tracking toward the scrotum; direct — peritoneal bulge through Hesselbach’s triangle medial to those vessels. The vessels are the divider, not the pubic tubercle alone. [1] | Occlusion test | Controlled (hernia does not reappear when deep ring occluded) | Not controlled (hernia still appears because it doesn't come through the deep ring) | | Strangulation risk | Higher (narrow deep ring) | Lower (wide neck through Hesselbach's) | | Proportion | 80% | 20% |
Hesselbach's Triangle (site of direct hernia):
- Inferior: Inguinal ligament
- Lateral: Inferior epigastric vessels
- Medial: Lateral border of rectus sheath [5]
Amyand's hernia: hernia sac containing the appendix (named after Claudius Amyand who performed the first successful appendectomy in 1735 on an 11-year-old boy with appendix in his inguinal hernia). Richter's hernia: only one sidewall (anti-mesenteric border) of the bowel is trapped — causes ischaemia but NOT obstruction (no complete luminal compromise). Littre's hernia: contains Meckel's diverticulum. Maydl's hernia: W-loop of bowel in the hernia sac. [1][4]
Visual recognition from the special-types slides: [1]
- Richter — only a crescent of bowel wall pinched in the defect while lumen continuity is preserved (the “small rupture” drawing).
- Pantaloon — two sacs straddling the inferior epigastrics (direct + indirect together).
- Amyand — open groin and laparoscopic photos of an inflamed appendix inside the hernia sac (first successful appendicectomy story is the eponym).
Richter's Hernia — The Dangerous Exception
Less common than inguinal hernia: 2–8% of all adult groin hernias. More common in females. Higher chance of strangulation due to tight opening (the femoral ring is rigid and unyielding, bounded by bone and ligament). [1]
Key landmarks: Femoral hernia emerges below and lateral to the pubic tubercle (cf. inguinal hernia: above and medial to the pubic tubercle). [1]
Femoral canal boundaries:
- Anterior: Inguinal ligament
- Posterior: Pectineal (Cooper's) ligament
- Medial: Lacunar ligament
- Lateral: Femoral vein
Why strangulation is common: The femoral ring is small and rigid — once bowel enters, it cannot easily return and venous congestion develops rapidly.
Surgical Approaches for Femoral Hernia
Three approaches: (a) Lockwood's infrainguinal approach, (b) Lotheissen's transinguinal approach, (c) McEvedy's high approach. Choice depends on whether there is strangulation. [1]
- Non-strangulated: Lockwood's (low, infrainguinal) — simple, below inguinal ligament
- Strangulated: McEvedy's high approach — allows better access to assess bowel viability and perform resection if needed
- Lotheissen's transinguinal approach: access through the inguinal canal [1]
Clinical Approach
Reducible groin mass → Hernia. Painful scrotal swelling → epididymo-orchitis/torsion. Painless scrotal enlargement → Hydrocele/Testicular tumour. Fullness/"bag of worms" → Varicocele. [1]
Intrinsic: family history, previous contralateral hernia, gender (male), age, abnormal collagen metabolism. Acquired: prostatectomy, obesity, chronic constipation, pulmonary disease (chronic cough). [1]
Why prostatectomy? During radical prostatectomy, the transversalis fascia and posterior inguinal canal structures can be disrupted. Also, post-prostatectomy patients may strain during voiding recovery. [1]
The pampiniform venous plexus drains blood from the testicles. [1]
This is relevant because varicocele (abnormal enlargement of the pampiniform plexus) is a common differential for scrotal swelling and a cause of male infertility.
This is OSCE-critical material.
Start with the patient STANDING. Inspect: describe the mass, visible cough impulse, scars. Palpate: describe the mass, can you get above it (scrotal vs. groin extending to scrotum?), palpable cough impulse, unilateral or bilateral. [1]
Then SUPINE. Inspect. Palpate. Identify the pubic tubercle and ASIS. Relationship of swelling to pubic tubercle? Reducible? Occlusion test. Examine abdomen for mass. Examine testes. [1]
Examination checklist (combined from lecture + clinical demonstration): [1][6][3]
- Consent + Exposure (nipple to mid-thigh)
- Standing:
- Inspect both groins and scrotum
- Ask patient to cough → visible cough impulse?
- Look for scars (previous repair?)
- Palpate the lump: site, size, shape, consistency, tenderness
- Can you get above it? (If no → inguinoscrotal = hernia or communicating hydrocele)
- Ask patient to cough → palpable expansile cough impulse
- Check both sides (20% bilateral)
- Supine:
- Identify pubic tubercle (first bony prominence lateral to pubic symphysis)
- Determine relationship: above & medial (inguinal) vs. below & lateral (femoral)
- Attempt gentle reduction
- Occlusion test: Reduce hernia → place finger firmly over deep ring (midpoint of inguinal ligament) → ask patient to stand and cough → if hernia stays reduced = indirect; if it reappears = direct
- Examine abdomen (mass? ascites causing ↑IAP?)
- Examine both testes (undescended? tumour?)
- Complete: Contralateral groin, genital examination, PR if indicated
Occlusion test accuracy for indirect inguinal hernia: 86%. For direct inguinal hernia: 35%. [1]
Why the difference? The test works by blocking the deep ring. If the hernia comes through the deep ring (indirect), blocking it works well. But direct hernias don't come through the deep ring, so the test is not designed to "catch" them — you can only infer a direct hernia when the test fails to control the bulge.
Physical examination alone is the primary diagnostic method. Ultrasound if uncertain. CT for complex cases. MRI or herniography less commonly used. [1]
Management
Symptomatic hernia → Surgery. Asymptomatic hernia → Watchful waiting (but 70% will need surgery within 5 years). [1]
High Yield — Watchful Waiting
Asymptomatic inguinal hernias can be managed with watchful waiting, but 70% will become symptomatic and require surgery within 5 years. Watchful waiting is NOT appropriate for femoral hernias (high strangulation risk). [1]
Herniotomy: excision of the hernia sac after reduction of contents. Herniorrhaphy: herniotomy + strengthening of posterior wall WITHOUT mesh. Hernioplasty: herniotomy + strengthening of posterior wall WITH mesh. [1]
Anaesthesia options by approach (from lecture flowchart): [1]
- Anterior mesh repair / Tissue repair: Local anaesthesia (LA), spinal/regional anaesthesia (SA), or general anaesthesia (GA)
- Open posterior repair (transinguinal or extrainguinal): LA/SA or GA
- Laparoscopic posterior repair (TEP / TAPP): GA
| Term | What it means | When used |
|---|---|---|
| Herniotomy | Remove sac only | Paediatric (children just need sac ligation; posterior wall is strong) |
| Herniorrhaphy | Sac removal + tissue repair | Shouldice, Bassini (no mesh — good for contaminated fields) |
| Hernioplasty | Sac removal + mesh repair | Lichtenstein, Stoppa, TEP, TAPP, eTEP (gold standard in adults) |
Open Repair
First published in 1986. Gold standard and most commonly performed hernia repair worldwide. Easy to learn, perform, teach, and effective. Recurrence rate < 1%. [1]
Why it's the gold standard: It's a "tension-free" repair — the mesh bridges the defect rather than pulling tissues together (which causes tension and higher recurrence). Can be done under local anaesthesia in a day surgery setting. [1]
An open preperitoneal (posterior) mesh repair, listed alongside Lichtenstein as an open mesh option. [1]
Best tissue (non-mesh) technique. Difficult to learn — in the Shouldice Hospital, surgeons are considered qualified only after 300 cases. [1]
When to use non-mesh repair: Contaminated field (e.g., strangulated hernia with bowel necrosis requiring resection — mesh in a dirty field → mesh infection). Also in young patients who request it.
Well-accepted alternative to open repair. Advantages: less early postoperative pain, less chronic pain. European Hernia Society guideline recommends endoscopic repair for both unilateral and bilateral hernias. Preferred approach for recurrent hernia after previous open repair. [1]
TEP vs. TAPP
TEP (Total Extraperitoneal Repair): directly dissects into the preperitoneal plane without perforating the peritoneum. TAPP (Transabdominal Preperitoneal Repair): enters the peritoneal cavity first (diagnostic laparoscopy), then incises peritoneum to enter the preperitoneal plane. [1]
TAPP and TEP have comparable outcomes. Choice depends on surgeon's skills and experience. TEP has a longer learning curve than TAPP. TAPP → more visceral injuries. TEP → more vascular injuries. [1]
| Feature | TEP | TAPP |
|---|---|---|
| Peritoneum entered? | No | Yes |
| Learning curve | Longer | Shorter |
| Visceral injury risk | Lower | Higher (working in peritoneal cavity) |
| Vascular injury risk | Higher (limited space, blind dissection) | Lower |
| Diagnostic laparoscopy? | No | Yes (can inspect abdomen first) |
| Adhesion risk | Lower | Higher (peritoneal breach) |
Laparo-endoscopic repair is recommended in females to decrease chronic pain risk and avoid missing a femoral hernia. In pregnant women: watchful waiting → self-limiting round ligament varicosities. [1]
Why laparoscopic for females? Femoral hernias are more common in females. Open anterior repair only addresses the inguinal defect and can miss a concurrent femoral hernia. Laparoscopic posterior repair with mesh covers the entire MPO, addressing both inguinal and femoral defects simultaneously. [1]
For recurrence after anterior repair → use posterior repair (laparoscopic). For recurrence after posterior repair → use anterior repair. The principle is to avoid scar tissue by switching approach. [1]
Key point: After a second recurrence (i.e., failure of both anterior and posterior approaches), the patient should be referred to a hernia specialist. [1]
Patient characteristics, local/national resources, surgical expertise, logistics all influence the choice of operation. [1]
Poor surgical technique, low surgical volume, and surgical inexperience are the main preoperative risk factors for recurrence. [1]
Low risk of complications (pain and recurrence), easy to learn, fast recovery, reproducible result, cost effective. [1]
Classifications
Classification designed for the posterior approach based on size of the internal ring and integrity of the posterior wall. Type 1: indirect hernia, normal internal ring. Type 2: indirect hernia, enlarged internal ring. Type 3a: direct inguinal hernia. Type 3b: indirect hernia causing posterior wall weakness. Type 3c: femoral hernia. Type 4: all recurrent hernias. [1]
Primary vs. Recurrent. Location: Lateral (Indirect) / Medial (Direct) / Femoral. Size: 0, 1 (≤ 1 finger), 2 (1–2 fingers), 3 (≥ 3 fingers), x. Example: Primary L2 = Primary indirect hernia, 1–2 finger breadths. [1]
Chronic Groin Pain (Inguinodynia)
Primary groin pain: not related to prior surgery. Secondary groin pain: began after a surgical procedure (including hernia repairs and orthopaedic surgery). [1]
Affects 10–12% of inguinal hernia repair patients. Defined as bothersome moderate pain impacting daily activities lasting at least 3 months postoperatively. Risk factors: young age, female gender, high preoperative pain, early high postoperative pain, recurrent hernia, open repair. [1]
Nociceptive pain: caused by activation of nociceptors by nociceptive molecules due to tissue injury/inflammation, transmitted via A-delta and C-fibres. Neuropathic pain: caused by direct nerve injury — contact with mesh, nerve entrapment by sutures, staples, tacks, folded mesh, or meshoma. [1]
The three nerves at risk during open inguinal hernia repair:
- Ilioinguinal nerve (L1) — most commonly injured
- Iliohypogastric nerve (L1)
- Genital branch of genitofemoral nerve (L1-2)
Scrotal Conditions
Paediatric emergency. Unilateral scrotal pain often associated with vomiting. Surgical emergency. [1]
Key points from supporting notes: [7]
- Two peak ages: neonatal and adolescent (12–18 years)
- Bell-clapper deformity: tunica vaginalis attaches high on the spermatic cord → testis hangs freely like a clapper in a bell → prone to torsion
- Examination: High-riding testis, horizontal lie, absent cremasteric reflex, negative Prehn's sign
- Time is testis: Irreversible damage after ~6 hours of warm ischaemia (salvage rate > 90% if < 6h, drops to < 10% after 24h)
- Management: Emergency scrotal exploration + detorsion ± orchidopexy (bilateral fixation — because bell-clapper is usually bilateral)
Fluid in the tunica vaginalis. Can get above it. Transillumination positive. Fluctuant. Testis not palpable (surrounded by fluid). USG to examine the testis (must rule out underlying testicular tumour causing secondary/reactive hydrocele). Primary vs. secondary hydrocele. [1]
Types (from slide diagram): [1][7]
| Type | Description |
|---|---|
| (a) Vaginal hydrocele | Most common adult type; fluid confined to tunica vaginalis around testis; processus vaginalis obliterated |
| (b) Congenital (communicating) hydrocele | Patent processus vaginalis → fluid communicates with peritoneal cavity → changes size with activity/Valsalva → most resolve by age 1–2 years |
| (c) Infantile hydrocele | Processus vaginalis obliterated at the deep ring but patent distally → fluid extends from testis to superficial ring but does not communicate with peritoneum |
| (d) Hydrocele of the cord (encysted) | Loculated fluid collection along the spermatic cord; processus obliterated above and below |
Management:
Needle aspiration or Jaboulay procedure (eversion of tunica vaginalis). [1]
- Aspiration: temporary (recurs), risk of infection — mainly for elderly/unfit patients
- Lord's plication or Jaboulay procedure: definitive surgery — sac is opened, fluid drained, tunica everted and sutured behind the cord
Abnormal enlargement of the pampiniform venous plexus in the scrotum. Occurs in ~15% of men. Left side more common than right (because left gonadal vein drains into left renal vein at right angles → higher hydrostatic pressure). May lead to fertility issues. [1]
"Bag of worms" felt on standing. Must rule out renal mass causing venous congestion. Nutcracker syndrome (left renal vein compressed between SMA and aorta). [1]
High Yield — Isolated Right Varicocele or New-Onset Varicocele
A new-onset varicocele (especially right-sided or one that does NOT decompress on lying flat) should raise suspicion for retroperitoneal mass (e.g., renal cell carcinoma) compressing the gonadal vein. Always examine the abdomen and consider imaging. [1]
Why left > right?
- Left gonadal vein → left renal vein (longer, enters at 90°, compressed by SMA = nutcracker)
- Right gonadal vein → IVC (shorter, enters at acute angle, better drainage)
Risk factors: 20–45 years old, undescended testis, family/personal history, white, HIV. Presentation: enlarged, firm, non-tender testis. Tumour markers: AFP, hCG, LDH-1. Treatment: inguinal radical orchidectomy ± RPLND (retroperitoneal lymph node dissection). [1]
Why inguinal (not scrotal) orchidectomy? To avoid disrupting scrotal lymphatic drainage (scrotum drains to superficial inguinal nodes; testis drains to para-aortic nodes). A scrotal incision could alter lymphatic drainage patterns and upstage the tumour. [1]
WHO Classification: Germ cell tumours (seminoma, embryonal carcinoma, teratoma, choriocarcinoma, yolk sac tumour) and sex cord stromal tumours (Leydig cell, Sertoli cell, granulosa cell, mixed). [1]
Chemotherapy regimens: BEP (bleomycin, etoposide, cisplatin) is the standard. Carboplatin for stage I pure seminoma only. [1]
The "25/M with testicular swelling and haemoptysis" vignette on slide 80 is a classic presentation of testicular choriocarcinoma with lung metastases (choriocarcinoma is highly vascular and spreads haematogenously). [1]
| Region | Conditions |
|---|---|
| Inguinal | Inguinal hernia, lymph nodes, encysted hydrocele of cord, saphena varix, undescended/ectopic testis, round ligament varicosities (pregnant women) |
| Inguinoscrotal | Inguinal hernia, lymph nodes, hydrocele (encysted/infantile/hernia sac) |
| Femoral | Femoral hernia, inguinal lymph nodes, distended psoas bursa, effusion in hip joint |
| Inguinofemoral | Skin (boils, sebaceous cyst, papillomas, warts), subcutaneous (lymph scrotum, filariasis) |
| Scrotal | Tunica vaginalis (hydrocele, pyocele, haematocele, chylocele), spermatic cord (varicocele, funiculitis, lipoma), testis (orchitis, neoplasms), epididymis (cysts, infections) |
Exam Intelligence
| Trap | How to discriminate |
|---|---|
| Inguinal vs. femoral hernia | Pubic tubercle: inguinal = above & medial; femoral = below & lateral |
| Direct vs. indirect | Inferior epigastric vessels: direct = medial; indirect = lateral. Occlusion test: indirect = controlled |
| Mid-inguinal point vs. midpoint of inguinal ligament | Mid-inguinal point → femoral pulse. Midpoint of inguinal ligament → deep ring |
| Richter's hernia vs. other strangulated hernias | Richter's = anti-mesenteric wall only → strangulation WITHOUT obstruction |
| Communicating hydrocele vs. indirect hernia | Both have inguinoscrotal swelling. Hydrocele: transilluminates, no bowel sounds, no cough impulse. Hernia: cough impulse, reducible with gurgle |
| Varicocele vs. hernia | Varicocele: "bag of worms," decompresses on lying, no cough impulse. Hernia: cough impulse, reducible |
| Testicular tumour vs. hydrocele | Tumour: hard, non-tender, does NOT transilluminate. Hydrocele: tense, transilluminates |
- "Cannot get above it" does NOT automatically mean hernia — a communicating hydrocele also cannot be gotten above, but it transilluminates
- Femoral hernia in exam = emergency — always think strangulation (exam rarely shows a non-urgent femoral hernia)
- Indirect hernia CAN occur in elderly — don't assume indirect = always young/congenital
- Sliding hernia — sigmoid colon (left) or caecum (right) forms part of the wall → careful not to injure viscera during dissection
- Testicular torsion is a clinical diagnosis — do NOT delay surgery for ultrasound if clinical suspicion is high
- Paediatric hernias (GC 203, GC 213): In children, indirect inguinal hernia is almost always congenital (patent processus vaginalis). Repair = herniotomy alone (no mesh needed — posterior wall is strong). Incarceration risk is higher in infants (especially < 1 year). [7]
- Abdominal examination (CFB): Always look for cough impulse at groin during routine abdominal examination — incisional hernia at scars, inguinal hernia at groins. [9]
- Intestinal obstruction (GC 195): Strangulated hernia (inguinal or femoral) is a cause of mechanical small bowel obstruction — must examine hernial orifices in every patient with IO. The classic teaching is: "Always examine the groins in a patient with intestinal obstruction." [8]
- Pelvic mass (GC 118): In females, a groin swelling may be a hydrocele of the canal of Nuck (the female equivalent of patent processus vaginalis). [5]
High Yield Summary
- Must-know for the exam
- Inguinal canal walls:** Anterior = EO aponeurosis; Posterior = transversalis fascia + conjoint tendon; Roof = IO + TA; Floor = inguinal ligament
- Direct vs. Indirect:** Direct = medial to inferior epigastric vessels, Hesselbach's triangle, acquired. Indirect = lateral to inferior epigastric vessels, through deep ring, can be congenital.
- Pubic tubercle relationship:** Inguinal hernia = above & medial. Femoral hernia = below & lateral.
- Occlusion test:** Deep ring at midpoint of inguinal ligament (ASIS to PT). Controlled = indirect (86% accuracy). Not controlled = direct (35% accuracy).
- Femoral hernia:** More common in females, high strangulation risk, always needs surgery.
- Richter's hernia:** Anti-mesenteric wall only → strangulation WITHOUT obstruction.
- Lichtenstein repair** = gold standard open mesh repair, < 1% recurrence.
- Laparoscopic (TEP/TAPP):** Recommended for bilateral, recurrent (after open), and female patients. TEP = no peritoneal breach; TAPP = peritoneal entry first.
- Recurrence management:** Switch approach (anterior → posterior or vice versa).
- CPIP:** 10–12% incidence, ≥ 3 months, risk factors = young, female, open repair.
- Scrotal DDx:** "Can you get above it?" + transillumination = the two key bedside tests.
- Testicular tumour:** Firm, painless, non-transilluminable. Radical INGUINAL orchidectomy. Markers: AFP, hCG, LDH.
- Varicocele:** Left-sided, "bag of worms," rule out renal mass.
- 70% of asymptomatic inguinal hernias need surgery within 5 years.**
- Always examine groins in IO and during abdominal exam.**
Active Recall - Lecture Notes
[1] Lecture slides: GC 193. Inguinal and scrotal swelling different types of hernia.pdf [2] Past papers: 2025 Fourth Summative MCQ.pdf (Questions 1–5, Section A EMQ — Regarding Hernias) [3] Lecture slides: Clinical Demonstration_Hernia perineum (Dr R Wei).pdf [4] Senior notes: Maksim Surgery Notes.pdf (pp. 155–156) [5] Senior notes: MBBS Final MB (Surgery) (Felix PY Lai).pdf (pp. 618–631) [6] Senior notes: Ryan Ho Fundamentals.pdf (p. 152) / Ryan Ho Urogenital.pdf (p. 220) [7] Senior notes: Adrian Lui Pediatrics Notes.pdf (pp. 346–348) [8] Past papers: 2019 Fourth Summative MCQ.pdf (EMQ Section VII, Q13–14) [9] Lecture slides: abdominal exam (MBBS IV) (student version).pdf (p. 18) / CFB History Taking and Physical Examination in general_Prof. M Co.pdf (p. 14)
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