Pelvic organ prolapse is the descent of one or more pelvic organs (bladder, uterus, or rectum) from their normal anatomical position due to weakening of the pelvic floor support structures.

Pelvic Organ Prolapse (POP)

2. Epidemiology

3. Anatomy and Function of the Female Pelvic Floor

Understanding POP requires a thorough understanding of what holds everything up in the first place. The pelvic floor is NOT just the levator ani — it is a misconception that the pelvic floor is only the levator ani muscles. More accurate would be to define it broader → includes all structures supporting pelvic cavity. So apart from levator ani, would include peritoneum, pelvic viscera, endopelvic fascia, levator ani, perineal membrane, superficial genital muscles ^[6].

Think of the pelvic floor as a multi-layered hammock suspended within the bony pelvis:

Layer	Structure	Function
1. Peritoneum	Visceral peritoneum covering pelvic organs	Outermost serosal covering; allows limited organ mobility
2. Pelvic viscera	Bladder, uterus, vagina, rectum	The organs themselves contribute to mutual support via packing effect
3. Endopelvic fascia (visceral ligaments & fascial condensations)	Cardinal-uterosacral ligament complex, pubocervical fascia, rectovaginal fascia	Suspends organs from pelvic sidewalls; connects organs to bony pelvis
4. Levator ani muscle (pelvic diaphragm)	Pubococcygeus (pubovaginalis, puboperinealis, puboanalis), iliococcygeus, coccygeus	Active muscular support; closes the urogenital hiatus; maintains constant tone
5. Perineal membrane	Triangular fibromuscular sheet spanning the anterior pelvic outlet	Supports distal urethra and vagina; provides attachment for perineal muscles
6. Superficial genital muscles	Bulbospongiosus, ischiocavernosus, superficial transverse perineal	Sphincteric and structural support of introitus

DeLancey described three levels of support, which directly map onto the types of prolapse. This is the framework for understanding POP anatomy:

Level	Structure	Support Mechanism	Prolapse if Defective
Level I (Apical/Superior)	Cardinal ligaments + Uterosacral ligaments	Suspend the upper vagina/cervix from the sacrum and lateral pelvic sidewalls	Uterine prolapse / Vault prolapse (post-hysterectomy)
Level II (Lateral/Mid-vaginal)	Pubocervical fascia (anteriorly) + Rectovaginal fascia (posteriorly)	Attach the mid-vagina laterally to the arcus tendineus fasciae pelvis (ATFP, "white line") and arcus tendineus levatoris ani	Cystocele (anterior), Rectocele (posterior)
Level III (Distal/Inferior)	Perineal body + Perineal membrane + Urogenital diaphragm	Fuse the distal vagina to surrounding structures (urethra anteriorly, perineal body posteriorly)	Urethrocele, Perineal descent

4. Risk Factors

Risk factors for POP can be broadly divided into those that weaken the pelvic floor (intrinsic) and those that increase the load on the pelvic floor (extrinsic/acquired).

Factors that adversely affect pelvic floor function ^[3]^[6]:

5. Aetiology and Pathophysiology

5.2 Pathophysiology by Compartment

The vagina is conceptually divided into three compartments, and prolapse can occur in any or all:

Compartment	Defect Site	Organ(s) Prolapsing	Name
Anterior (most common, ~34–50%)	Pubocervical fascia (Level II anterior)	Bladder → Cystocele; Urethra → Urethrocele (combined: Cystourethrocele)	Anterior vaginal wall prolapse
Apical/Middle	Cardinal + Uterosacral ligaments (Level I)	Uterus → Uterine prolapse; Vault (post-hysterectomy) → Vault prolapse	Apical prolapse
Posterior	Rectovaginal fascia (Level II posterior) + perineal body (Level III)	Rectum → Rectocele; Small bowel → Enterocele; Sigmoid → Sigmoidocele	Posterior vaginal wall prolapse

Important: multiple compartments are often involved simultaneously. An isolated single-compartment prolapse is actually uncommon — most women have multi-compartment involvement because the supporting structures are interconnected.

6. Classification

As described above:

Compartment	Type	Definition
Anterior	Urethrocele	Prolapse of urethra
	Cystocele	Prolapse of bladder
	Cystourethrocele	Combined prolapse of bladder and urethra
Apical (Middle)	Uterine prolapse	Descent of uterus
	Vault prolapse	Descent of vaginal vault (post-hysterectomy)
	Enterocele	Herniation of small bowel through pouch of Douglas
Posterior	Rectocele	Prolapse of rectum into posterior vaginal wall
	Sigmoidocele	Prolapse of sigmoid colon
	Perineal descent	Descent of perineal body

Classify based on compartment of vagina that is weakened → Anterior → cystourethrocele; Middle → uterine / vault prolapse; Posterior → rectocele ^[5].

6.2 By Severity — The POP-Q System (Pelvic Organ Prolapse Quantification)

The POP-Q is the internationally standardised, validated, and reproducible system for grading POP (ICS/IUGA standard). It replaced older subjective grading systems.

The POP-Q uses the hymen as the fixed reference point (defined as 0). Measurements are made in centimetres:

Negative values (–) = above/proximal to the hymen (i.e., inside)
Positive values (+) = below/distal to the hymen (i.e., outside the body)

Point	Location	Measures
Aa	Anterior vaginal wall, 3 cm proximal to urethral meatus	Anterior wall descent (range: –3 to +3)
Ba	Most distal (dependent) position of anterior vaginal wall	Anterior wall descent (range: –3 to +tvl)
C	Most distal edge of cervix or vaginal cuff	Apical descent
D	Posterior fornix (only if uterus present)	Posterior fornix descent
Ap	Posterior vaginal wall, 3 cm proximal to hymen	Posterior wall descent (range: –3 to +3)
Bp	Most distal (dependent) position of posterior vaginal wall	Posterior wall descent (range: –3 to +tvl)
gh	Genital hiatus	Measured from mid-urethral meatus to posterior hymen
pb	Perineal body	Measured from posterior hymen to mid-anal opening
tvl	Total vaginal length	Greatest depth of vagina when reduced

Stage	Definition
Stage 0	No prolapse; all points are ≥ 3 cm above hymen (Aa, Ba, Ap, Bp all at –3)
Stage I	Most distal prolapse is > 1 cm above the hymen (leading edge < –1)
Stage II	Most distal prolapse is within 1 cm of the hymen (between –1 and +1)
Stage III	Most distal prolapse is > 1 cm below the hymen but not complete eversion (leading edge > +1 but < +(tvl – 2))
Stage IV	Complete eversion; essentially the entire vaginal length has prolapsed (leading edge ≥ +(tvl – 2))

POP-Q Exam Tip

A common student mistake is confusing the old "grading" system (Grades 1–4 based on introitus) with the POP-Q staging. The POP-Q uses the hymen as the reference point, NOT the introitus. The POP-Q is the standard and is what you should use in clinical practice and exams.

This older system is sometimes still used clinically:

Grade	Description
1st degree	Descent within the vagina, not reaching the introitus
2nd degree	Descent to the level of the introitus
3rd degree	Descent beyond the introitus (partial eversion)
4th degree (Procidentia)	Complete eversion of the vaginal canal

7. Clinical Features

7.1 Symptoms

POP symptoms are best understood by relating them back to the compartment involved and the degree of descent.

General Principle

Symptoms of POP correlate poorly with the degree of prolapse on examination. A woman with Stage II prolapse may be very symptomatic, while another with Stage III may be asymptomatic. What matters is whether the prolapse reaches or goes beyond the hymen — this is the threshold at which most women become symptomatic.

Symptom	Pathophysiological Basis
Sensation of a mass/lump coming out through the introitus ^[5] — "I felt a lump below"	Direct perception of prolapsing organ/vaginal wall protruding through the introitus; the most specific symptom for POP
Sensation of pelvic heaviness/pressure/dragging	Weight of the prolapsed organ pulling on the remaining support structures; traction on the uterosacral ligaments (which are pain-sensitive)
Symptoms worse with prolonged standing or straining and better when lying down	Gravity-dependent: standing increases the load on the pelvic floor; lying down removes the gravitational vector
Need to manually reduce the mass to void or defecate — sometimes required manual reduction of the mass in order to void ^[5]	The prolapsed organ mechanically obstructs the urethra or rectum; manual reduction restores the anatomical relationship allowing passage
Low back pain or sacral aching	Traction on the uterosacral ligaments (which attach to the sacrum at S2–S4) by the descending uterus

Symptom	Pathophysiological Basis
Urinary frequency and urgency	Incomplete bladder emptying → residual urine → reduced functional capacity → need to void more often; also detrusor overactivity from chronic stretching
Sensation of incomplete emptying ^[5]	Cystocele creates a "pouch" below the bladder outlet → urine pools in the dependent part of the cystocele below the level of the internal meatus → residual urine remains
Straining to pass urine ^[5] — hesitancy, poor stream	The prolapsed bladder/urethra becomes kinked → outflow obstruction → need to generate higher pressure to void → straining
Urinary retention (AROU) ^[5]	Severe cystocele kinks the urethra completely → cannot void → retention. Need reduction of uterus before urination → or else it will kink the urethra, cannot urinate ^[5]
Stress urinary incontinence (SUI) — leakage with cough, sneeze, exertion	Pelvic floor weakness → loss of urethral support → urethral hypermobility → during ↑abdominal pressure, the urethra does not receive adequate backboard support → urine leaks ^[8]
Occult stress incontinence ^[3]^[4]^[7]	A large prolapse kinks the urethra → mechanically prevents leakage → SUI is masked. When prolapse is reduced (either manually or surgically), the kink is relieved and SUI becomes apparent. Remember the possibility of occult stress incontinence in case of severe prolapse ^[3]^[7]
Recurrent UTIs	Chronic residual urine → urinary stasis → bacterial colonization

Occult Stress Incontinence — Critical Exam Point

Remember the possibility of occult stress incontinence in case of severe prolapse ^[3]^[7]. Before prolapse surgery, you MUST test for occult SUI by reducing the prolapse (e.g., with a pessary or manually) and then performing a cough stress test. If SUI is unmasked, concurrent anti-incontinence surgery may be needed. If surgery is indicated, surgery for both conditions may be needed ^[3]^[7].

Symptom	Pathophysiological Basis
Difficulty defecating / Obstructed defecation	Rectocele creates a pocket where stool collects → faeces enters the rectocele instead of the anal canal → "trapping" effect → sensation of blockage
Need to splint (digitally support perineum or posterior vaginal wall) to defecate ^[5]	Pressing on the posterior vaginal wall or perineum pushes the rectal contents out of the rectocele back into the rectal lumen → directed toward the anal canal
Sensation of incomplete evacuation	Stool remains in the rectocele after defecation
Faecal incontinence (less common)	Associated pelvic floor injury (especially external anal sphincter disruption from obstetric injury)

Symptom	Pathophysiological Basis
Dyspareunia (painful intercourse)	Exposed vaginal mucosa → dryness and ulceration → pain during intercourse
Reduced sexual satisfaction	Widened vaginal introitus, sensation of "looseness"; also psychological impact
Avoidance of sexual intercourse	Embarrassment from visible/palpable mass; fear of worsening prolapse

7.2 Signs (On Examination)

The patient should be examined in the dorsal lithotomy position and asked to bear down / Valsalva to demonstrate the maximal extent of prolapse. A Sims speculum (posterior vaginal wall retractor) is used to sequentially assess each compartment:

Sign	Finding	Pathophysiological Basis
Anterior wall descent (Cystocele)	Bulging of anterior vaginal wall, especially on straining; smooth, soft, reducible mass	Bladder herniating through deficient pubocervical fascia
Cystocele 2 cm beyond the introitus ^[5]	POP-Q Ba = +2; clinical stage III anterior prolapse	Significant pubocervical fascial defect allowing bladder to protrude beyond hymen
Cervical/uterine descent	The cervix descended to 1 cm beyond the introitus ^[5]	Cardinal/uterosacral ligament failure; Level I defect
Posterior wall descent (Rectocele)	Bulging of posterior vaginal wall; may feel stool in the rectocele on rectal exam	Rectovaginal fascial defect
Enterocele	Bulge at the vaginal apex; may see/feel peristalsis; impulse on cough; differentiated from rectocele by transillumination or rectal exam (enterocele is above the rectovaginal septum)	Peritoneal sac with bowel herniating through pouch of Douglas
Ulceration/Keratinization	Dry, thickened, whitened, or ulcerated mucosa on the prolapsed organ	Chronic exposure of normally moist vaginal mucosa to air → desiccation → keratinization; if traumatized → decubitus ulcer
Atrophic vaginitis	Thin, pale, dry vaginal mucosa; may have petechiae	Oestrogen deficiency → mucosal atrophy

Ageing population: Hong Kong has one of the longest life expectancies globally → increasing prevalence of POP in elderly women.
Lower BMI threshold for Asian women: WHO recommends lower BMI cut-offs for overweight/obesity in Asian populations (overweight ≥ 23, obese ≥ 25 vs. ≥ 25/≥ 30 in Western populations). However, obesity rates in Hong Kong are rising.
Cultural factors: many Chinese women are reluctant to report symptoms of POP or incontinence due to embarrassment → likely underreported.
Dietary factors: chronic constipation is common in the elderly Hong Kong population → contributes to POP.
Occupational factors: previously, many women in Hong Kong were engaged in manual labour → heavy lifting as a contributing factor.
Public hospital services: POP is managed primarily in the public sector at HA hospitals, with waiting times for elective surgery often being long → conservative management with pessaries is widely used as a bridge or definitive treatment.

High Yield Summary

Definition: POP = descent of pelvic organs (bladder, uterus, vault, rectum, bowel) through the vaginal canal due to failure of pelvic floor support.

Epidemiology: Affects up to 50% of parous women on exam; ~10–20% symptomatic. 1 in 9 women undergoes surgery for POP/UI. POP waxes and wanes — it is dynamic.

Anatomy: Pelvic floor = peritoneum + viscera + endopelvic fascia + levator ani + perineal membrane + superficial genital muscles. DeLancey's 3 levels of support: Level I (apical: cardinal/uterosacral ligaments), Level II (lateral: pubocervical + rectovaginal fascia), Level III (distal: perineal body/membrane).

Risk Factors ("PELVIC"): Parity (vaginal delivery, forceps, macrosomia, long 2nd stage), Estrogen deficiency, Lifting/occupation, Visceral pressure (obesity, cough, constipation), Inherent weakness (genetics, collagenopathy, age), Cutting (prior surgery).

Most important risk factor: Vaginal delivery (OR 4.7 for parity; > 90% of POP patients are parous).

Classification: By compartment (anterior = cystocele/urethrocele; apical = uterine/vault; posterior = rectocele/enterocele). POP-Q staging (0–IV) uses hymen as reference point.

Key Clinical Features: Sensation of mass/"lump below," pelvic heaviness, urinary symptoms (frequency, retention, SUI), bowel symptoms (obstructed defecation, splinting), sexual dysfunction. Remember occult SUI in severe prolapse.

POP + Incontinence: Share the same pathophysiology (weak pelvic floor). Commonly coexist. Surgery for both conditions may be needed if surgery indicated.

Active Recall - Pelvic Organ Prolapse (POP)

Differential Diagnosis of Pelvic Organ Prolapse (POP)

When a woman presents with the constellation of "a lump below," pelvic heaviness, urinary symptoms, and/or bowel symptoms, POP is high on the differential — but it is not the only diagnosis. The differential diagnosis must be approached systematically from two angles:

What else could mimic the presenting symptoms of POP? (i.e., DDx of the symptom complex)
What else could cause a mass at the introitus/vaginal canal? (i.e., DDx of the physical finding)

Additionally, within a confirmed POP, you must classify which compartment(s) are involved — classify based on compartment of vagina that is weakened → Anterior → cystourethrocele; Middle → uterine / vault prolapse; Posterior → rectocele ^[5] — because the management differs by compartment.

1. Differential Diagnosis of a "Lump at the Introitus / Vaginal Mass"

This is the clinical scenario you will most commonly face: a woman says "I felt a lump below" or a mass is seen protruding from the vagina on examination.

Condition	Key Distinguishing Features	Why it can mimic POP
Pelvic organ prolapse (the diagnosis itself)	Mass varies with straining/position; reducible; smooth vaginal wall covering; compartment-specific (cystocele, uterine, rectocele)	The most common cause of a vaginal mass in a parous, postmenopausal woman
Cervical polyp	Small, smooth, red/pink pedunculated mass arising from the cervical os; often causes intermenstrual/postcoital bleeding	Can protrude through the introitus and be mistaken for early cervical prolapse, but it arises from the cervical canal (not a descent of the entire cervix)
Uterine fibroid (pedunculated submucous)	Firm, round mass protruding through the cervical os; may be necrotic/infected; uterus enlarged on bimanual exam	A pedunculated submucous fibroid can prolapse through the os and appear as a vaginal mass. Uterine fibroid is an important differential diagnosis of pelvic mass ^[9]^[10]
Cervical/vaginal malignancy	Irregular, friable, bleeding mass; hard and fixed; foul-smelling discharge; weight loss; postmenopausal bleeding	Advanced cervical or vaginal carcinoma can present as a mass at the introitus; biopsy is essential if suspicious
Bartholin's cyst/abscess	Unilateral, tense, cystic swelling at the posterolateral introitus (4 or 8 o'clock position); tender if infected	Located at the introitus but distinctly lateral and does not vary with straining
Vaginal cyst (Gartner's duct cyst, inclusion cyst)	Smooth, non-tender, cystic swelling on the anterolateral vaginal wall; does not change with Valsalva	Can feel like a cystocele but is a discrete cyst within the vaginal wall, not a fascial defect
Urethral diverticulum	Tender anterior vaginal wall mass; discharge of pus from urethra on compression ("milking" the urethra); dysuria, dyspareunia	Located anteriorly and may mimic a small cystocele, but it is a focal outpouching from the urethra
Vaginal vault granulation tissue (post-hysterectomy)	Small, red, friable tissue at the vaginal vault; bleeds easily; history of recent hysterectomy	May be mistaken for early vault prolapse

Condition	Key Distinguishing Features	Why it can mimic POP
Rectal prolapse	Full-thickness rectal mucosa protruding through the anus (NOT the vagina); concentric mucosal folds; may coexist with POP	Can be confused with a large rectocele or procidentia if the patient cannot distinguish between vaginal and anal protrusion. Key distinction: rectal prolapse has concentric folds, while a rectocele bulges through the posterior vaginal wall
Pelvic/abdominal mass pushing organs down	History of abdominal distension; pelvic mass palpable bimanually or on abdominal exam; USS/imaging confirms	A large ovarian mass, uterine fibroid, or other pelvic mass ^[9]^[10] can push the pelvic organs downward, mimicking or causing secondary prolapse
Urethral caruncle	Small, red, fleshy, tender mass at the urethral meatus; common in postmenopausal women; bleeding on contact	Located specifically at the urethral meatus; can be mistaken for a small urethrocele
Imperforate hymen with haematocolpos (in adolescents)	Bulging, bluish membrane at introitus; primary amenorrhoea; cyclical pelvic pain	Relevant in young patients — the distended vagina can mimic a vaginal mass

Don't Forget Pregnancy!

Don't forget about pregnancy → especially for teenage girls ^[9]. In any woman of reproductive age presenting with a "pelvic mass" or symptoms that could suggest POP, always exclude pregnancy first (urine β-hCG). A gravid uterus can present as a pelvic mass and can exacerbate pre-existing prolapse.

2. Differential Diagnosis of the Symptom Complex

POP rarely presents with just a mass — it presents with a constellation of urinary, bowel, vaginal, and sexual symptoms. Each symptom has its own differential:

Mrs Wong presented with urinary retention, urinary frequency, sensation of incomplete emptying, and straining to void ^[5]. These urinary symptoms are not unique to POP.

Symptom	DDx Beyond POP	How to Distinguish
Urinary frequency + urgency	Overactive bladder (OAB/detrusor overactivity), UTI, interstitial cystitis, bladder stone, bladder cancer, DM (polyuria)	OAB: urgency is the dominant symptom, no mass. UTI: dysuria, pyuria, positive culture. Interstitial cystitis: chronic pain, dx of exclusion ^[8]^[11]. Bladder cancer: painless haematuria, older patient.
Stress urinary incontinence	Urethral hypermobility without POP, intrinsic sphincter deficiency (ISD), mixed incontinence	SUI can occur independently of POP due to isolated urethral sphincter dysfunction. Urodynamics helps distinguish ^[8].
Urinary retention (AROU)	Mechanical causes: BPH (not in females), CA bladder neck, urethral stricture, stones, clots; POP; pelvic/GI masses; pregnancy ^[12]. Functional causes: neurological (spinal cord compression, peripheral neuropathy, stroke), drug-induced (sympathomimetics, anticholinergics), post-operative ^[12].	In females, POP is the most common mechanical cause of AROU. DM → innervation to pelvic floor impaired ^[5] can cause detrusor underactivity contributing to retention. Always check for neurological causes (especially cauda equina syndrome — a surgical emergency).
Overflow incontinence	Detrusor underactivity (neurogenic bladder, DM neuropathy), bladder outlet obstruction ^[8]	PVR measurement is key; urodynamics to confirm

AROU in Females — Key DDx

In females, the causes of AROU differ from males ^[12]^[13]:

Detrusor underactivity is more common ^[13] (vs. BOO in males)
Obstructive causes include: organ prolapse (e.g., cystocele), gynaecological tumours (e.g., fibroid) ^[13]
Drug-induced causes: always check medication history — sympathomimetics (ephedrine, phenylephrine in cough mixture), anticholinergics (atropine) ^[12]
Neurological causes: must rule out spinal cord compression (cauda equina) — check perianal sensation, anal tone, lower limb neurology

Symptom	DDx Beyond POP	How to Distinguish
Obstructed defecation / Need to splint	Functional constipation, rectal intussusception, rectal prolapse, pelvic floor dyssynergia, colorectal mass	If no vaginal mass: consider non-POP causes. Defecating proctography or dynamic MRI can delineate anatomy.
Faecal incontinence	Anal sphincter injury (obstetric), pudendal neuropathy, rectal prolapse, neurological disease	Endoanal USS to assess sphincter integrity; anorectal manometry

DDx	How to Distinguish
POP	Mass visible/palpable on straining; characteristic positional symptoms
Chronic pelvic pain / Pelvic congestion syndrome	Dull aching pelvic pain, worse premenstrually, varicosities on vulva; no mass on examination
Pelvic mass (fibroid, ovarian tumour)	Bimanual exam reveals discrete mass; USS confirms; history and physical examination usually help to suggest a diagnosis ^[10]
Endometriosis	Cyclical pain, dysmenorrhoea, dyspareunia; tenderness on examination; may have uterosacral nodularity

Once POP is confirmed, the critical next step is to determine which compartment(s) are involved, as this guides management. This is essentially a "differential within the diagnosis."

Feature	Anterior (Cystocele/Urethrocele)	Apical (Uterine/Vault Prolapse)	Posterior (Rectocele/Enterocele)
Vaginal wall	Anterior wall bulges	Cervix/vault descends	Posterior wall bulges
Mass characteristics	Soft, smooth; may express urine on compression	Cervix visible at/beyond introitus; elongated or normal cervix	Soft; may feel stool in the pouch on rectal exam
Dominant urinary sx	Frequency, retention, SUI, incomplete emptying	Can cause retention if severe (drags bladder)	Less common unless coexistent cystocele
Dominant bowel sx	Less common	Less common	Obstructed defecation, need to splint, incomplete evacuation
Examination	Bulge of anterior wall with posterior speculum retracting posterior wall	Cervix descends toward/beyond introitus on straining	Bulge of posterior wall with anterior speculum retracting anterior wall
Sims speculum use	Retract posterior wall → assess anterior	Assess descent of cervix/vault	Retract anterior wall → assess posterior

Internal organ prolapse, resulting in AROU → classify based on compartment of vagina that is weakened: Anterior → cystourethrocele; Middle → uterine / vault prolapse; Posterior → rectocele ^[5].

5. Key Diagnostic Pitfalls and Associations

This is a common exam question. Both cause posterior vaginal wall descent, but:

Feature	Rectocele	Enterocele
Contents	Rectum	Small bowel / omentum
Location	Lower posterior wall	Upper posterior wall / apex
Rectal exam	Finger enters the bulge through the rectal wall	Finger does NOT enter the bulge (it is above the rectovaginal septum)
Transillumination	Negative (solid stool)	May be positive (bowel/fluid)
Impulse on cough	Less marked	More marked (bowel is more mobile)
Post-hysterectomy	Less common as isolated finding	More common (pouch of Douglas herniates)

Feature	Rectal Prolapse	POP (Rectocele/Procidentia)
Protrusion from	Anus	Vagina
Mucosal folds	Concentric (full thickness rectal wall)	Rugose vaginal mucosa
Lumen	Visible rectal lumen centrally	No lumen visible
Associated symptoms	Faecal incontinence, mucus discharge per rectum	Vaginal mass, urinary symptoms

High Yield DDx Approach for Exams

When asked for the differential diagnosis of POP in an exam, structure your answer as:

Confirm POP and classify by compartment (anterior, apical, posterior — this IS part of the DDx)
Other causes of vaginal/introital mass: cervical polyp, prolapsed fibroid, Bartholin cyst, urethral caruncle, vaginal/cervical malignancy, vaginal cyst
Other causes of the presenting symptoms: OAB, UTI, neurogenic bladder, functional constipation, pelvic mass, pelvic congestion
Exclude sinister pathology: cervical/vaginal/bladder malignancy (especially if ulcerated/bleeding)
Exclude pregnancy in reproductive-age women
Identify occult SUI in severe prolapse

Active Recall - DDx of Pelvic Organ Prolapse

References

^[3] Lecture slides: GC 116. I felt a lump below urinary incontinence in females; genital prolapse.pdf (p37, p74) ^[5] Lecture slides: Block C - O&G Theme Case 4.pdf (p2, p4) ^[7] Lecture slides: Block C - I felt a lump below_ urinary incontinence in females; genital prolapse.pdf (p65) ^[8] Senior notes: Ryan Ho Urogenital.pdf (p159–160 – Approach to Urinary Incontinence) ^[9] Lecture slides: Block C - Pelvic mass_ ovarian cancer and cysts; uterine fibroid; pelvic imaging.pdf (p17) ^[10] Lecture slides: GC 118. Pelvic mass ovarian cancer and cysts; uterine fibroid; pelvic imaging.pdf (p71) ^[11] Senior notes: Ryan Ho Urogenital.pdf (p121 – Approach to Dysuria) ^[12] Senior notes: Maksim Surgery Notes.pdf (p310 – AROU causes) ^[13] Senior notes: Ryan Ho Urogenital.pdf (p164 – AROU in females); Ryan Ho Fundamentals.pdf (p349 – AROU in females)

Diagnosis of Pelvic Organ Prolapse (POP) — Diagnostic Criteria, Algorithm and Investigations

There is no single "diagnostic criteria" checklist for POP in the way that, say, rheumatoid arthritis has ACR/EULAR criteria. Instead, the diagnosis rests on a combination of:

Component	What Constitutes the Diagnosis
Symptoms	Vaginal bulge/mass, pelvic heaviness, dragging sensation — symptoms that correlate with anatomical descent (see Clinical Features section)
Signs	Demonstrable descent of one or more vaginal compartments on Valsalva, quantified by POP-Q staging
POP-Q staging	Stage ≥ II (leading edge within 1 cm of the hymen) is generally considered the threshold for clinically significant prolapse, as this is when symptoms typically begin. Stage 0 and I are common incidental findings in parous women and are usually asymptomatic.
Symptom-bother correlation	The degree of prolapse must correlate with the patient's symptoms and impact on quality of life. POP is only a clinical problem when it bothers the patient.

Clinically Significant POP

The key threshold is whether the leading edge reaches the hymen. Most expert guidelines (IUGA, ICS, NICE 2019, ACOG) agree that POP-Q Stage ≥ II (leading edge at or beyond the hymen) correlates best with symptoms. Stage I prolapse on examination alone, without symptoms, does NOT require treatment or even a formal diagnosis in most cases.

3. The Clinical Examination — The Cornerstone of Diagnosis

A Sims speculum (a single-bladed retractor) is the instrument of choice — NOT a Cusco bivalve speculum, because you need to retract one vaginal wall at a time to assess each compartment independently.

Step	Technique	What You Are Assessing
1	Retract posterior wall with Sims speculum → observe anterior wall on straining	Anterior compartment: cystocele, urethrocele
2	Retract anterior wall with Sims speculum → observe posterior wall on straining	Posterior compartment: rectocele, enterocele
3	Remove speculum → observe descent of cervix/vault on straining	Apical compartment: uterine prolapse, vault prolapse
4	Perform cough stress test with prolapse reduced (Sims speculum supporting vaginal walls)	Occult stress incontinence — remember the possibility of occult stress incontinence in case of severe prolapse ^[3]^[7]

Test	Purpose	Technique	Interpretation
Cough stress test	Detect SUI or occult SUI	Patient coughs with comfortably full bladder; repeat with prolapse reduced	Urine leakage = positive → SUI present. There was evidence of urine leakage upon straining (stress urinary incontinence) ^[5]
Bimanual examination	Rule out pelvic masses	Bimanual palpation of uterus and adnexae	The uterus was small and the adnexae were clear ^[5]
Rectal examination	Assess rectocele extent, anal sphincter tone, rectal masses	Finger in rectum while examining posterior vaginal wall	Finger enters bulge = rectocele; does not enter = enterocele (above septum). Also assess resting and squeeze anal tone. Test reflexes: anal reflex, bulbocavernosus reflex (BCR, S2-4) ^[8]
Post-void residual	Assess completeness of bladder emptying	Catheterisation or USS after voiding	PVR > 100 mL = significant; suggests outlet obstruction (cystocele kinking urethra) or detrusor underactivity

4. Investigation Modalities

Investigations are ordered in a stepwise fashion — from basic bedside tests to specialised studies reserved for complex or surgical cases.

Investigation	Why	Key Findings	Interpretation
Urinalysis + Urine C/ST ^[5]^[8]^[14]	Rule out UTI (which can cause frequency/urgency mimicking POP symptoms); rule out haematuria (which may indicate bladder pathology)	Leucocytes, nitrites, bacteria, RBCs	Positive culture → treat UTI before attributing symptoms to POP. Urine for C/ST ^[5] — AROU → Foley insertion + documentation of first catheterisation urine volume, send urine for c/st ^[5]
Bladder diary (voiding diary / frequency-volume chart) ^[8]^[14]^[15]	Quantify voiding pattern, fluid intake, episodes of incontinence; essential for differentiating types of incontinence	Record for ≥ 3 days: time and volume of each void, fluid intake, incontinence episodes, pad usage, triggers	Frequency > 8 voids/day = abnormal. Nocturia ≥ 2 = significant. Nocturnal polyuria (> 33% of 24h output at night) = nocturnal polyuria rather than OAB. Bladder diary: record the frequency and volume of fluid drank/voided ^[8]
Post-void residual (PVR)	Assess incomplete emptying; detect overflow incontinence/retention	Measured by in-out catheterisation or bladder USS	PVR < 50 mL = normal. PVR 50–100 mL = borderline. PVR > 100 mL = significant residual → suspect outlet obstruction (cystocele) or detrusor underactivity. The bladder was full and palpable in the suprapubic region ^[5] → suggests retention
Blood tests: RFT, fasting glucose	RFT (obstructive uropathy) ^[14]^[15] — chronic retention from severe POP can cause back-pressure on kidneys. Glucose (DM is a RF) ^[14]^[15] — DM neuropathy contributes to detrusor underactivity. DM → innervation to pelvic floor impaired ^[5]	Elevated creatinine → obstructive uropathy. Elevated glucose → undiagnosed/poorly controlled DM	Elevated RFT warrants upper tract imaging (USS kidneys) to rule out hydronephrosis
KUB (plain abdominal X-ray) ^[5]	Quick screen for faecal loading (constipation), bladder distension, urinary tract calculi	Radio-opaque stones, faecal loading, soft tissue mass	AROU → Foley insertion... KUB ^[5] — part of immediate workup for urinary retention

4.2 Tier 2: Specialised Investigations (Selected Patients)

These are used when diagnosis is unclear, symptoms are complex, surgery is being planned, or there is concern about coexisting pathology.

Feature	Detail
What	Non-invasive measurement of urine flow rate — the patient voids into a flowmeter
Why	Screens for bladder outlet obstruction (BOO); helps differentiate obstructive from non-obstructive voiding dysfunction ^[14]^[15]
Requirements	Volume voided > 150 mL to be representative of usual voiding habit ^[15]
Key parameters	Peak urine flow rate (Qmax): normal ≥ 15 mL/s in women. Post-void residual volume ^[15]
Interpretation	Qmax < 15 mL/s = suggestive of BOO. Abnormal flow pattern (plateau or intermittent) = obstruction or straining. High PVR = incomplete emptying. Uroflowmetry: screening for BOO (does not rule out DUA!) ^[14]^[15]
Limitation	Cannot distinguish BOO from detrusor underactivity (DUA) — both give low flow. Need urodynamics to differentiate ^[14]^[15]

Feature	Detail
What	The gold standard for assessing lower urinary tract function — measures bladder pressure, abdominal pressure, and flow simultaneously ^[14]^[15]
Why for POP	To confirm the type of incontinence (SUI vs UUI vs mixed), assess detrusor function, detect occult SUI, and plan surgery
Procedure	Contrast injection into bladder via catheter. While voiding, measure: intravesical pressure (cystometrogram), rectal pressure (surrogate for intra-abdominal pressure), detrusor pressure = intravesical – intra-abdominal pressure, uroflow rate, bladder volume, ± contrast cystogram ^[14]^[15]
Key findings in POP context
Urodynamic stress incontinence (USI)	Leakage demonstrated on coughing/straining in the absence of detrusor contraction → confirms urodynamic stress incontinence ^[5]
Detrusor overactivity (DO)	Involuntary detrusor contractions during filling phase → confirms urge incontinence component
Voiding phase obstruction	↓uroflow + ↑detrusor pressure → BOO ^[14]^[15]; ↓uroflow + ↓detrusor pressure → hypocontractile detrusor (DUA) ^[14]^[15]
Occult SUI	With prolapse reduced (by pessary or speculum during UDS), provoked leakage on cough → confirms occult SUI
Indication in POP	Urodynamics: gold-standard for dx of BOO ^[14]^[15]. Indicated when: surgery is planned (especially if mixed symptoms), previous surgery failed, neurological disease suspected, uncertain diagnosis after basic evaluation

Urodynamic Stress Incontinence vs Clinical Stress Incontinence

Clinical SUI = the patient reports leakage with cough/exertion (a symptom). Urodynamic stress incontinence (USI) = leakage is objectively demonstrated during urodynamic testing on provocation (cough/strain), with no concurrent detrusor contraction (a urodynamic diagnosis) ^[5]. USI is the more precise diagnosis and is what you confirm before offering surgical treatment for SUI. The theme case learning objective specifically states: Describe the typical symptom and sign of urodynamic stress incontinence and pelvic organ prolapse and their common association in a woman ^[5].

Feature	Detail
Modalities	Trans-abdominal USS (TAUS) vs Transvaginal USS (TVUS) ^[16]
TAUS	4-5 MHz (lower frequency for better penetration). Require full bladder (as acoustic window). Advantages: panoramic view — good for large masses, larger coverage. Usually preferred as 1st line (less invasive) ^[16]
TVUS	Up to 10 MHz. Full bladder not required. Smaller field of view — improved resolution and contrast, better anatomical details, reduced attenuation ^[16]
Why for POP	(1) Rule out pelvic masses (fibroid, ovarian mass) contributing to or mimicking POP. PV detect left adnexal mass... which investigation is most appropriate? → Transvaginal US ^[16]. (2) Assess uterine size and morphology (relevant if hysterectomy planned). (3) Assess PVR (non-invasive alternative to catheterisation). (4) Translabial/transperineal USS can directly visualise levator ani, measure levator hiatal area, and assess bladder neck mobility — increasingly used in research and specialised centres.
Key findings	Uterine fibroids, ovarian cysts/masses, PVR volume, endometrial thickness (in postmenopausal women with bleeding)

Modality	When to Use in POP	Key Findings
MRI Pelvis	Complex or recurrent POP; preoperative planning for multi-compartment prolapse; suspected levator avulsion; research settings. Dynamic MRI (MRI defecography) can visualise all three compartments simultaneously during Valsalva.	Levator ani defects/avulsion, fascial defects, multi-compartment descent, pelvic masses
CT Abdomen/Pelvis	Not routinely used for POP itself. Used if: suspecting upper tract obstruction (hydronephrosis from chronic retention), pelvic mass, malignancy workup	Hydronephrosis, pelvic masses, incidental findings

Feature	Detail
When	If haematuria is present (to rule out bladder malignancy); suspected bladder pathology (stones, fistula, diverticulum); recurrent UTIs
Not routine for straightforward POP
Findings	Bladder trabeculation (from chronic obstruction), bladder stones, tumour, fistula

Feature	Detail
When	Significant posterior compartment symptoms (obstructed defecation, need to splint) not adequately explained by clinical exam
What	Fluoroscopic imaging during defecation (or dynamic MRI equivalent) — visualises rectocele, enterocele, intussusception, pelvic floor descent in real-time
Limitation	Invasive, not widely available; reserved for complex cases

Before any surgical intervention for POP, the following must be completed:

Assessment	Purpose
POP-Q staging	Formal documentation of prolapse degree/compartment
Urodynamics with prolapse reduced	Detect occult SUI → If surgery is indicated, surgery for both conditions may be needed ^[3]^[7]
Pelvic USS	Rule out concurrent pelvic pathology; assess uterine size
Cervical screening status	Ensure up-to-date (especially if hysterectomy planned)
Endometrial assessment	If postmenopausal bleeding present → TVUS endometrial thickness ± endometrial biopsy (to rule out endometrial cancer before hysterectomy)
Renal function + upper tract imaging	If chronic retention or elevated PVR → USS kidneys to rule out hydronephrosis
Optimisation of comorbidities	Treat chronic cough, constipation, control DM, weight loss — these affect surgical outcomes and recurrence

Investigation	When	What It Tells You	Key Points
POP-Q examination	All patients	Stage and compartment of prolapse	Clinical gold standard; hymen is reference point
Urinalysis + C/ST	All patients	Rule out UTI	Must treat UTI before attributing symptoms to POP
Bladder diary	All patients with urinary symptoms	Voiding pattern, fluid intake, incontinence episodes	≥ 3 days; helps differentiate OAB vs SUI vs nocturnal polyuria
PVR	All patients with voiding difficulty	Completeness of emptying	> 100 mL = significant; suggests obstruction or DUA
RFT, glucose	All patients	Renal function, DM status	Elevated creatinine → upper tract imaging
KUB	If retention/acute presentation	Stones, faecal loading, bladder distension	Part of AROU workup
Uroflowmetry	If voiding symptoms prominent	Screens for BOO	Does not differentiate BOO from DUA
Urodynamics	Pre-surgical; complex/mixed symptoms; previous failed surgery	Type of incontinence, detrusor function, occult SUI	Gold standard. Must reduce prolapse during testing.
Pelvic USS	Pre-surgical; suspected pelvic mass	Uterine/adnexal pathology, PVR	TVUS for detail; TAUS for panoramic view
MRI pelvis	Complex/recurrent POP; research	Levator morphology, multi-compartment anatomy	Dynamic MRI = "defecography"
Cystoscopy	If haematuria; suspected bladder pathology	Rule out bladder cancer, stones, fistula	Not routine for POP

Investigation Pearls for Exams

Common mistakes:

Ordering CT or MRI for straightforward POP — this is unnecessary. POP is a clinical diagnosis. Imaging is reserved for complex cases, suspected masses, or pre-surgical planning.
Forgetting to test for occult SUI before prolapse surgery — this is a must-do. If you miss it, the patient will be incontinent post-operatively.
Not sending urine for C/ST — UTI symptoms overlap with POP symptoms. Always exclude UTI.
Confusing uroflowmetry with urodynamics — uroflowmetry is a screening tool (flow rate only); urodynamics is the gold standard (pressure + flow simultaneously). Uroflowmetry: screening for BOO (does not rule out DUA!) ^[14]^[15].

High Yield Summary

POP is a clinical diagnosis — made by history + POP-Q examination with Sims speculum + Valsalva.

No specific "diagnostic criteria" — diagnosis requires demonstrable descent (POP-Q Stage ≥ II = clinically significant) + symptom correlation + exclusion of other causes.

Basic investigations (all patients): Urinalysis + C/ST, bladder diary, PVR, RFT, glucose, ± KUB.

Specialised investigations (pre-surgical/complex): Uroflowmetry (screens BOO, does not exclude DUA), Urodynamics (gold standard — confirms USI vs DO, detects occult SUI with prolapse reduced), Pelvic USS (rule out masses), ± MRI, ± cystoscopy.

Critical pre-surgical requirement: Urodynamics with prolapse reduced → test for occult SUI → may need concomitant anti-incontinence surgery.

Urodynamic stress incontinence (USI) = objectively demonstrated leakage on cough/strain during urodynamics without detrusor contraction — the precise diagnosis before surgical SUI treatment.

Active Recall - Diagnosis of Pelvic Organ Prolapse

References

^[3] Lecture slides: GC 116. I felt a lump below urinary incontinence in females; genital prolapse.pdf (p74) ^[5] Lecture slides: Block C - O&G Theme Case 4.pdf (p1, p2, p4) ^[7] Lecture slides: Block C - I felt a lump below_ urinary incontinence in females; genital prolapse.pdf (p65) ^[8] Senior notes: Ryan Ho Urogenital.pdf (p160–161 – Approach to Urinary Incontinence: history, examination, investigations) ^[14] Senior notes: Ryan Ho Fundamentals.pdf (p355, p357 – LUTS evaluation, uroflowmetry, urodynamics) ^[15] Senior notes: Ryan Ho Urogenital.pdf (p170 – LUTS evaluation); Maksim Surgery Notes.pdf (p316 – IPSS, uroflowmetry, PVR) ^[16] Senior notes: Ryan Ho Radiology.pdf (p32, p40 – Female pelvic imaging, TAUS vs TVUS)

Management of Pelvic Organ Prolapse (POP)

When a woman presents acutely with POP — for example, Mrs. Wong presented with urinary retention ^[5] — the immediate priorities are:

Immediate Action	Rationale
AROU → Foley insertion + documentation of first catheterisation urine volume, send urine for C/ST ^[5]	Relieve urinary retention, quantify the degree of retention (volume on first catheterisation), and rule out UTI
KUB ^[5]	Screen for faecal loading, bladder stones, or other contributing factors
Manual reduction of the prolapse	Need reduction of uterus before urination → or else it will kink the urethra, cannot urinate ^[5]. Reduce the prolapse gently with a moist swab; this may restore voiding ability
Topical oestrogen cream to exposed/ulcerated mucosa	Exposed vaginal/cervical mucosa in procidentia becomes oedematous, keratinised, or ulcerated. Topical oestrogen promotes mucosal healing, reduces inflammation, and reduces oedema before any surgical intervention
Moist saline dressings over irreducible/ulcerated prolapse	Prevents further desiccation and promotes healing
Treat underlying precipitants	Treat constipation (fleet enema), control chronic cough, review medications (stop anticholinergics/sympathomimetics if contributing to retention)

First Catheterisation Volume

Always document the volume of urine drained at first catheterisation. This tells you the degree of retention (e.g., > 500 mL is significant; > 1 L is chronic). Be aware of post-decompression haematuria — sudden drainage of a chronically overdistended bladder can cause haematuria due to release of tamponade on bladder mucosal vessels. Some centres advocate slow decompression (clamp catheter after draining 500 mL, re-open after 15 min), though evidence is debated.

4. Conservative (Non-Surgical) Management

Conservative management is available but rarely curative ^[3]^[7]. However, it is the first-line approach for most women and may be the definitive treatment for women who are unfit for surgery, decline surgery, or have mild symptoms.

Intervention	Mechanism	Evidence
Weight loss	Reduces chronic intra-abdominal pressure load on the pelvic floor; Obesity is a risk factor for progression in vaginal descent ^[3]^[4]	Observational data support that weight loss reduces POP symptoms
Treat chronic cough	Reduces repetitive increases in intra-abdominal pressure; COPD → chronic cough, increased abdominal pressure ^[5]	Smoking cessation, optimise COPD management
Treat chronic constipation	Reduces straining at stool, which directly loads the pelvic floor	Dietary fibre, adequate hydration, laxatives as needed
Reduce caffeine/alcohol intake ^[8]	Caffeine is a bladder irritant → worsens frequency/urgency; alcohol is a diuretic	Part of lifestyle advice for coexistent urinary symptoms
Provide information and educate women to promote pelvic floor function ^[5]	Empowerment; understanding of condition improves compliance with conservative measures	Patient education leaflets, specialist nurse counselling

Nonsurgical treatment using ring pessary for patients who decline surgery, unfit for surgery or temporary measure while awaiting surgery ^[3].

What is a pessary? A pessary is a silicone or PVC device inserted into the vagina to mechanically support the prolapsed organs. It works like a "shelf" or "dam" that holds the organs up. Think of it as a prosthetic pelvic floor.

Types of pessaries:

Type	Description	Best For
Ring pessary (most commonly used)	A flexible silicone ring that sits in the vaginal fornices; can be folded for insertion	Stage I–III prolapse; most first-line choice; Ring pessary ^[5] is specifically mentioned
Shelf/Gellhorn pessary	Has a flat disc with a stem; provides greater support but harder to insert/remove	Stage III–IV prolapse; procidentia
Cube pessary	Suction cup mechanism; adheres to vaginal walls	Stage III–IV; when ring pessary fails
Donut pessary	Circular donut shape; provides space-filling support	Moderate-severe prolapse

Sizing: Size of pessary chosen so that it gives support to the prolapse organ but does not cause discomfort to the patient ^[3]. The largest pessary that is comfortable and stays in place should be used.

Fitting algorithm: Try one size, if fall out → try bigger size, if fall out → try two, if fall out → surgery ^[5]. This is the practical stepwise approach.

Complications of pessary use: Complications include pressure ulcer, bleeding and infection with discharge ^[3].

Complication	Mechanism	Prevention/Management
Vaginal erosion / Pressure ulcer	Chronic pressure from the pessary on atrophic vaginal mucosa → ischaemia → ulceration	Use topical oestrogen cream concurrently (thickens and strengthens vaginal mucosa); regular review and removal
Vaginal discharge / Infection	Foreign body in vagina → altered flora → bacterial vaginosis or secondary infection	Regular cleaning; pessary removal and cleaning at review visits
Bleeding	Erosion of vaginal mucosa	Topical oestrogen; consider changing pessary type/size
Incarceration / Neglect	Forgotten pessary left in for years → embedded in vaginal wall	Foreign body, change every 4 to 6 months ^[5] — regular review schedule essential
Fistula formation (rare)	Severe pressure necrosis → vesicovaginal or rectovaginal fistula	Very rare with proper follow-up

Monitoring: Change every 4 to 6 months ^[5]. At each review:

Remove the pessary, clean it
Inspect the vaginal mucosa for erosion/ulceration
Reassess the prolapse
Reinsert (same or adjusted size)

Evidence for pessary use:

Effect of Pessary Use on Genital Hiatus Measurements in Women With Pelvic Organ Prolapse ^[18] — this observational study showed:

After 3 months of pessary use, genital hiatus size decreased significantly ^[18]
Pessary use results in significant anatomic changes to the genital hiatus in patients with pelvic organ prolapse ^[18]
This means pessaries don't just passively hold things up — they may actually remodel the pelvic floor over time by reducing the hiatal area

Mrs. Wong opted for ring pessary as she noted significant improvement in her urinary symptoms and dragging discomfort with the conservative treatment ^[5].

When to Escalate from Pessary to Surgery

Mrs. Wong came back 2 days following discharge because the ring pessary fell out when she opened her bowel. A new ring pessary of a larger size was inserted, but it fell out shortly afterwards. She now decided to undergo surgery ^[5].

Indications to move from pessary to surgery:

Pessary repeatedly falls out despite upsizing
Pessary causes persistent discomfort
Vaginal erosion/ulceration not responsive to topical oestrogen
Patient preference for definitive treatment
Worsening symptoms despite pessary

Medication for urge incontinence ^[5] — if the woman has a significant urge incontinence component:

Drug Class	Mechanism	Examples	Key Points
Anticholinergics (Muscarinic antagonists) ^[8]^[15]	Block M2/M3 muscarinic receptors on detrusor muscle → reduce involuntary contractions → ↓urgency and frequency	Oxybutynin, solifenacin ^[15]	S/E: dry mouth, dry eye, constipation, cognitive impairment ^[15]. C/I if residual urine > 150 mL due to risk of AROU ^[15] — particularly relevant in POP patients who already have ↑PVR!
Beta-3 agonist ^[15]	Activate β3-adrenergic receptors on detrusor → promote relaxation during filling phase	Mirabegron ^[15]	S/E: elevated BP ( > 10%) ^[15]. Alternative for those intolerant of anticholinergics
Bladder training	Timed voiding with gradual increase in intervals; suppressing urgency with distraction techniques	—	First-line non-pharmacological for urge incontinence

Anticholinergics in POP — Caution!

Anticholinergics are contraindicated if residual urine > 150 mL due to risk of AROU ^[15]. Women with significant POP often already have elevated PVR due to cystocele kinking the urethra. Giving anticholinergics to these women can push them into acute retention. Always check PVR before prescribing anticholinergics for urge incontinence in a woman with POP.

5. Surgical Management

Surgery is indicated when conservative measures fail or are not suitable. The choice of procedure depends on: compartment(s) involved, uterus present or absent, desire for future sexual function, patient's fitness, and whether concomitant anti-incontinence surgery is needed.

Indication	Explanation
Failed conservative management	Ring pessary fell out... She now decided to undergo surgery ^[5]
Severe/bothersome symptoms despite conservative trial	Significant impact on QoL that conservative measures cannot adequately address
Complications of POP	Recurrent UTIs from chronic retention, obstructive uropathy, chronic ulceration of prolapsed mucosa, irreducible prolapse
Patient preference	After adequate counselling about risks/benefits, some women prefer definitive surgical treatment

5.2 Reconstructive Surgery (Preserves Vaginal Function)

Reconstructive procedures aim to restore normal anatomy while preserving vaginal capacity and sexual function.

Feature	Detail
What	Vaginal approach: plication (suturing together) of the attenuated pubocervical fascia under the anterior vaginal wall to reduce the cystocele
Why it works	Reinforces the deficient fascial "hammock" that normally supports the bladder → pushes the bladder back to its normal position
Indication	Symptomatic cystocele / anterior wall prolapse
Recurrence rate	Relatively high — up to 30–40% anatomical recurrence (though not all are symptomatic)
Consideration	Mesh augmentation was previously used to reduce recurrence, but the use of transvaginal mesh for anterior prolapse has been restricted/banned in many jurisdictions (FDA 2019, NICE 2024) due to complications including mesh erosion, chronic pain, and dyspareunia

Feature	Detail
What	Vaginal approach: plication of the rectovaginal fascia + perineorrhaphy (repair of the perineal body)
Why it works	Reinforces the posterior vaginal wall support → pushes the rectum back posteriorly
Indication	Symptomatic rectocele
Consideration	Over-aggressive narrowing can cause dyspareunia; site-specific defect repair (identifying and closing specific fascial tears) may be preferred over traditional midline plication

Vaginal hysterectomy → remnant vault → but the problem is that vault can prolapse as well ^[5].

Feature	Detail
What	Removal of the uterus via the vaginal route + concomitant apical suspension procedure to prevent subsequent vault prolapse
Why	If the uterus is prolapsed and the woman has no desire for fertility, removing the uterus eliminates the most visible component of the prolapse. BUT the vault must be suspended, otherwise it will prolapse (the ligaments were already deficient)
Vault suspension options	McCall culdoplasty (closes the cul-de-sac and reattaches the vault to the uterosacral ligaments); Sacrospinous fixation (attaches the vault to the sacrospinous ligament)
Key point	The problem is that vault can prolapse as well → then have to think of: Colpocleisis ^[5] or re-suspension procedures

Feature	Detail
What	Vaginal approach: the vaginal vault (or cervix in uterus-preserving surgery) is sutured to the sacrospinous ligament (a strong ligament running from the ischial spine to the sacrum)
Why it works	The sacrospinous ligament is one of the strongest structures in the pelvis → provides robust Level I support to the vaginal apex
Indication	Apical prolapse (uterine or vault prolapse); can be combined with anterior/posterior repair
Pros	Vaginal approach (no abdominal incision); shorter operating time than sacrocolpopexy
Cons	Unilateral fixation (usually right-sided) → can create an asymmetric vagina; risk of pudendal nerve/vessel injury (close to ischial spine); higher recurrence rate for anterior wall than sacrocolpopexy

If young and fit, laparoscopic sacrocolpopexy → not first line, have to have done vaginal hysterectomy before → 3 hours ^[5].

Feature	Detail
What	Abdominal (laparoscopic or robotic) approach: a synthetic mesh is used to bridge the vaginal vault (or cervix) to the anterior longitudinal ligament on the sacral promontory
Why it works	Provides a permanent, strong suspension of the vaginal apex to the sacrum using mesh as a "neo-ligament" → restores Level I support. The mesh replaces the function of the failed cardinal-uterosacral ligament complex
Indication	Apical prolapse, especially: young/fit patients; recurrent prolapse after vaginal surgery; congenital collagenopathies → cannot use patient's own tissues to reconstruct, so use mesh ^[5]
Pros	Highest long-term success rates for apical prolapse (~90% at 5 years); preserves vaginal length and axis → better sexual function outcomes
Cons	3 hours ^[5] (long operating time); abdominal approach (higher risk in obese patients); mesh-related complications (erosion ~3–5%, though lower than transvaginal mesh); cost
Important note	This is the gold standard for apical prolapse repair in fit patients. It is distinct from transvaginal mesh (which has been restricted) — sacrocolpopexy mesh is placed abdominally and has a much lower erosion rate

For elderly or medically unfit women who do not desire future vaginal intercourse, obliterative procedures offer a simpler, safer surgical option with very high success rates.

5.3.1 Colpocleisis

Colpocleisis → close the vagina ^[5].

Feature	Detail
What	Surgical closure (partial or complete) of the vaginal canal by denuding and suturing together the anterior and posterior vaginal walls
Types	Total colpocleisis (complete closure) or LeFort colpocleisis (partial closure — leaves lateral channels for cervical mucus/blood drainage)
Why it works	Eliminates the vaginal space through which organs can prolapse → essentially "fills the gap." Very high success rate ( > 95%)
Indication	Elderly/unfit women with severe prolapse; no desire for future vaginal intercourse
Pros	Short operative time; can be done under local/regional anaesthesia; very low recurrence; minimal blood loss
Cons	Close the vagina → in the future will not be able to do cervical smears or endometrial workup ^[5] — must ensure cervical screening is up-to-date and endometrial pathology is excluded BEFORE surgery. Irreversible loss of vaginal function.

Colpocleisis — Don't Forget Pre-op Screening!

In the future will not be able to do cervical smears or endometrial workup ^[5]. Before colpocleisis:

Ensure cervical screening (Pap smear/HPV) is up-to-date
If postmenopausal bleeding: TVUS endometrial thickness + endometrial biopsy to rule out endometrial cancer
Once the vagina is closed, you cannot access the cervix or endometrial cavity for surveillance or sampling

If surgery is indicated, surgery for both conditions may be needed ^[3]^[7].

If urodynamics with prolapse reduced reveals occult SUI (or the patient has overt SUI), a concomitant anti-incontinence procedure should be performed at the same time as prolapse repair.

Procedure	Mechanism	Key Points
Tension-free vaginal tape (TVT) ^[15]	A polypropylene mesh tape placed mid-urethrally via a retropubic or transobturator route; acts as a "backboard" for the urethra during increases in abdominal pressure	Gold standard for SUI. Retropubic route (TVT) or transobturator route (TVT-O/TOT). Cure rate ~80–90% at 5 years
Burch colposuspension	Laparoscopic/open: sutures from paravaginal tissue to Cooper's ligament → elevates the bladder neck	Can be done at the same time as laparoscopic sacrocolpopexy
Fascial sling	Autologous rectus fascia placed under mid-urethra	Alternative when synthetic mesh is contraindicated

Compartment	Conservative	Vaginal Surgery	Abdominal Surgery
Anterior	PFMT, pessary, topical oestrogen	Anterior colporrhaphy	± Paravaginal repair (if lateral defect; can be done laparoscopically)
Apical	Pessary, PFMT	Vaginal hysterectomy + vault suspension; SSF; Manchester repair	Laparoscopic sacrocolpopexy / sacrohysteropexy
Posterior	PFMT, pessary, dietary fibre	Posterior colporrhaphy + perineorrhaphy	Rarely needed; addressed at time of sacrocolpopexy if indicated
Multi-compartment	Pessary, PFMT	Combined vaginal procedures	Sacrocolpopexy ± anterior/posterior repair
Elderly/unfit	Pessary (often definitive)	Colpocleisis	— (too frail for abdominal approach)

Mrs Wong's discharge plan ^[5]:

Step	Action	Rationale
1	Ring pessary ^[5]	Non-surgical support of prolapse; immediate symptom relief
2	Teach pelvic floor exercise / bladder training ^[5]	Strengthen levator ani; retrain bladder → improve both POP and UI symptoms
3	Medication for urge incontinence? ^[5]	If urge component is prominent and PVR is acceptable ( < 150 mL), consider anticholinergics or mirabegron
4	Topical oestrogen	Standard adjunct in postmenopausal women; reduces pessary complications and improves mucosal health
5	Lifestyle modification	Weight loss, treat cough and constipation, reduce caffeine
6	Review with frequency-volume chart	She was discharged home the next day and was scheduled to be seen in 1 month time to review her symptoms and the frequency-volume chart ^[5]

What are the common indications for non-surgical management of genital prolapse and stress incontinence? ^[5]

Non-Surgical Management	Surgical Management
Mild-moderate symptoms (POP-Q Stage I–II)	Severe symptoms or POP-Q Stage III–IV refractory to conservative Mx
Patient preference for conservative approach	Failed conservative management (pessary falls out, persistent symptoms)
Patient unfit for surgery (multiple comorbidities)	Complications: recurrent UTI, obstructive uropathy, chronic ulceration
Pregnancy planned (defer surgery until childbearing complete)	Patient preference after adequate counselling
Temporary measure while awaiting surgery	Occult SUI requiring concomitant anti-incontinence procedure
Newly diagnosed — trial conservative Mx first	Irreducible/incarcerated prolapse

9. Special Considerations

Observe → Ring pessary → Surgery ^[5] — the stepwise approach
Colpocleisis is an excellent option if the patient does not desire vaginal function
Can be done under local/spinal anaesthesia with minimal morbidity

High Yield Summary

Management Principles: Symptom-based; conservative first; address coexistent SUI; informed shared decision-making.

Immediate (AROU): Foley catheter + reduce prolapse + urine C/ST + KUB + topical oestrogen.

Conservative (First Line): (1) PFMT — 3 sets of 8–12 contractions, 8–10s, TDS, ≥ 15–20 weeks; evidence from POPPY trial. (2) Ring pessary — mechanical support; change q4–6 months; complications: erosion, infection, bleeding. (3) Topical oestrogen — thickens vaginal mucosa, reduces erosion. (4) Lifestyle — weight loss, treat cough/constipation, reduce caffeine.

Conservative is available but rarely curative. If pessary falls out → try bigger → try two → surgery.

Surgical — Reconstructive: Anterior colporrhaphy (cystocele), Posterior colporrhaphy (rectocele), Vaginal hysterectomy + vault suspension (apical), Sacrospinous fixation (vaginal approach), Sacrocolpopexy (gold standard for apical prolapse in fit patients; mesh to sacral promontory).

Surgical — Obliterative: Colpocleisis — for elderly/unfit women not desiring vaginal function. Must screen cervix/endometrium pre-op (cannot access after closure).

Concomitant Anti-Incontinence: If occult SUI demonstrated → TVT or Burch colposuspension at the same time. Surgery for both conditions may be needed.

Anticholinergics for urge UI: C/I if PVR > 150 mL — risk of AROU.

Mesh: Transvaginal mesh for POP is restricted/banned. Abdominal mesh (sacrocolpopexy) is different and still gold standard for apical prolapse.

Active Recall - Management of Pelvic Organ Prolapse

References

^[3] Lecture slides: GC 116. I felt a lump below urinary incontinence in females; genital prolapse.pdf (p44, p74) ^[4] Lecture slides: Block C - I felt a lump below_ urinary incontinence in females; genital prolapse.pdf (p32) ^[5] Lecture slides: Block C - O&G Theme Case 4.pdf (p1, p2, p5) ^[7] Lecture slides: Block C - I felt a lump below_ urinary incontinence in females; genital prolapse.pdf (p65) ^[8] Senior notes: Ryan Ho Urogenital.pdf (p161 – Management of urinary incontinence: general measures, PFMT, biofeedback, bladder training) ^[15] Senior notes: Maksim Surgery Notes.pdf (p317–318 – BPH/OAB medical management: anticholinergics, beta-3 agonist, TVT); Ryan Ho Urogenital.pdf (p173 – LUTS management) ^[17] Lecture slides: GC 116. I felt a lump below urinary incontinence in females; genital prolapse.pdf (p49 – POPPY Trial) ^[18] Lecture slides: GC 116. I felt a lump below urinary incontinence in females; genital prolapse.pdf (p48 – Pessary and genital hiatus study)

Complications of Pelvic Organ Prolapse (POP)

Complications of POP can be divided into two broad categories:

Complications of the disease itself — what happens if POP is left untreated or progresses
Complications of treatment — pessary-related and surgery-related complications

Understanding complications from first principles requires you to think about what happens when pelvic organs sit where they shouldn't: the prolapsed organ is exposed, kinked, compressed, or distorted → leading to predictable downstream consequences on the urinary tract, bowel, vaginal mucosa, and sexual function.

1. Complications of Untreated / Progressive POP

These are the most clinically significant complications and the ones most likely to bring the patient to acute medical attention (as in Mrs Wong's case).

Complication	Pathophysiological Mechanism	Clinical Significance
Acute retention of urine (AROU) ^[5]^[13]^[19]	A large cystocele or uterine prolapse kinks the urethra → mechanical bladder outlet obstruction → cannot void. Need reduction of uterus before urination → or else it will kink the urethra, cannot urinate ^[5]. POP (cystocele, rectocele, uterovaginal prolapse) is listed as a cause of extramural compression leading to mechanical BOO ^[13]^[19]	AROU is the most common urological emergency ^[13]. Mrs Wong presented with this. Requires immediate catheterisation and prolapse reduction.
Chronic retention of urine (CROU)	Incomplete emptying over weeks to months → progressive overdistension of the bladder → detrusor muscle stretched beyond optimal length → overdistension can stretch detrusor muscles beyond their optimal length of action, leading to ineffective contraction ^[13] → vicious cycle of worsening retention	Insidious; may present as painless distension (especially if neuropathy coexists, e.g., DM → innervation to pelvic floor impaired ^[5]), overflow incontinence, or incidental finding
Recurrent urinary tract infections (UTIs)	Incomplete emptying → residual urine → urinary stasis → bacterial colonisation and growth → recurrent lower UTIs (cystitis). May ascend to cause pyelonephritis	Very common in women with significant POP; must be distinguished from other causes of recurrent UTI
Overflow incontinence ^[8]	BOO/DUA → bladder over-distension with continuous dribbling ^[8]. The bladder fills to capacity, then the intravesical pressure exceeds the (impaired) outlet resistance → urine leaks out in a constant dribble, especially at night or with position changes	Signs: significant post-void residual, palpable bladder ^[8]. May be mistaken for urge or stress incontinence if not checked for PVR
Bladder stones	Chronic urinary stasis → mineral precipitation in residual urine → stone formation in the dependent part of the cystocele	Complications of chronic retention: bladder stones and UTI ^[20] — although described in the context of BPH, the mechanism is identical in POP-related chronic retention
Obstructive uropathy ^[8]^[20]	Severe chronic retention → back-pressure from the over-distended bladder → transmitted retrograde through the ureters → bilateral hydronephrosis → renal parenchymal compression → renal impairment. Obstructive uropathy: hydronephrosis, pyelonephrosis, renal impairment ^[20]	This is the most dangerous urinary complication of POP — it can lead to chronic kidney disease and even end-stage renal failure if unrecognised. Mrs Wong had mild renal impairment ^[5] — this may be partially attributable to chronic obstruction. Always check RFT and do upper tract USS (kidneys) if there is significant PVR or chronic retention.

Why does POP cause urinary complications? The fundamental mechanism is simple:

Cystocele → bladder base drops below urethral meatus → urethra kinked → outflow obstruction
→ incomplete emptying → residual urine → stasis → UTIs + stones
→ chronic retention → overdistension → overflow incontinence
→ back-pressure → hydronephrosis → renal impairment

The 'Cascade of Obstruction'

POP is not just a nuisance — it can cause real organ damage. The cascade from urethral kinking → incomplete emptying → chronic retention → obstructive uropathy → renal failure is the same cascade seen in BPH in men. The key difference is that in women, the obstruction is extrinsic (prolapsed organ compressing/kinking the urethra) rather than intrinsic (enlarged prostate). Always check renal function and upper tract imaging in women with significant POP and voiding difficulty.

Complication	Pathophysiological Mechanism	Clinical Features
Mucosal desiccation and keratinisation	The vaginal/cervical mucosa is normally moist (maintained by vaginal secretions and oestrogen). When prolapsed beyond the introitus, this mucosa is exposed to air → dries out → undergoes squamous metaplasia and keratinisation (the epithelium thickens and becomes "skin-like" as a protective response)	Thick, white, dry, leathery appearance of the prolapsed mucosa
Decubitus ulcer	Chronic exposure + friction from clothing + oestrogen deficiency → mucosal breakdown → ulceration. The dependent part of the prolapse bears the most pressure and is most prone to ulceration	Shallow, clean or infected ulcer on the leading edge of the prolapse. Can bleed, discharge, and become secondarily infected. Must biopsy any persistent ulcer to rule out cervical/vaginal malignancy
Vaginal bleeding / Discharge	Ulceration → raw surface → haemoserous or purulent discharge; contact bleeding from friable mucosa	May be the presenting complaint; always rule out malignancy in a postmenopausal woman with bleeding
Secondary infection	Exposed, ulcerated, moist surface → bacterial colonisation	Foul-smelling discharge; may cause cellulitis of the prolapsed tissue

Complication	Pathophysiological Mechanism
Obstructed defecation	Rectocele traps stool → mechanical obstruction to rectal evacuation → need to splint. Posterior prolapse may be associated with bowel symptoms e.g. splinting ^[3]^[19]
Faecal impaction	Chronic obstructed defecation → stool accumulates in the rectocele/rectum → hardens → impaction. This creates a vicious cycle: impaction worsens the prolapse by increasing straining
Faecal incontinence	Shared pelvic floor injury (external anal sphincter disruption, pudendal neuropathy) → loss of anal sphincter continence. Not caused by the prolapse itself but by the same underlying pathology

Complication	Mechanism
Dyspareunia	Exposed, dry, atrophic vaginal mucosa → painful intercourse. Ulcerated or keratinised mucosa is particularly sensitive
Reduced sexual satisfaction	Widened vaginal introitus; sensation of "looseness"; visible/palpable mass during intercourse
Sexual avoidance	Embarrassment, fear of worsening the prolapse, body image disturbance → significant psychosocial impact

Complications include pressure ulcer, bleeding and infection with discharge ^[3]^[19].

Complication	Mechanism	Prevention / Management
Pressure ulcer / Vaginal erosion ^[3]^[19]	Chronic mechanical pressure from pessary on atrophic vaginal mucosa → ischaemic necrosis → ulceration	Topical oestrogen cream (standard co-prescription); regular review with removal and mucosal inspection every 4–6 months; change every 4 to 6 months ^[5]
Bleeding ^[3]^[19]	Erosion of vaginal mucosa → raw surface bleeds	Topical oestrogen; consider upsizing or changing pessary type; if persistent, biopsy to rule out malignancy
Infection with discharge ^[3]^[19]	Foreign body in vagina → disrupted vaginal flora → bacterial vaginosis or secondary infection → offensive discharge	Regular cleaning; pessary removal and cleaning at review; vaginal antiseptic/antibiotic if clinically infected
Incarceration / Embedded pessary	Neglected pessary left in situ for years → vaginal wall grows over and incorporates the pessary → can only be removed surgically	Strict follow-up schedule; patient education; avoid "lost to follow-up"
Vesicovaginal or rectovaginal fistula (very rare)	Severe pressure necrosis from a neglected, incarcerated pessary erodes through the vaginal wall into the bladder or rectum	Very rare with modern follow-up; requires surgical repair if it occurs
Failure / Expulsion	Pessary does not stay in place due to severely widened levator hiatus, very weak pelvic floor, or inappropriate sizing → ring pessary fell out when she opened her bowel ^[5]	Try larger size; try different type (Gellhorn, shelf); if still failing → try one size, if fall out → try bigger size, if fall out → try two, if fall out → surgery ^[5]

3. Complications of Surgical Treatment

Complication	Mechanism	Notes
Haemorrhage	Pelvic surgery involves vascular territory (uterine artery, vaginal branches, internal iliac)	Risk of intraoperative or postoperative bleeding; may require transfusion or re-exploration
Infection	Surgical wound; vaginal vault cuff infection; UTI from catheterisation	Prophylactic antibiotics reduce risk
Venous thromboembolism (DVT/PE)	Pelvic surgery → venous stasis + endothelial injury + lithotomy position → Virchow's triad	Thromboprophylaxis with LMWH + compression stockings
Urinary tract injury	Bladder or ureteric injury during dissection — the ureter runs close to the uterine artery ("water under the bridge") and is at risk during hysterectomy	Cystoscopy at the end of surgery to confirm bilateral ureteric jets; ureteric stenting if injury suspected
Bowel injury	Rare; more likely in enterocele repair or when dense adhesions are present	May require bowel repair or temporary stoma
Anaesthetic complications	General or regional anaesthesia risks	Standard pre-operative assessment

3.2 Complications Specific to POP Surgery

This is the most common long-term complication of prolapse surgery.

Aspect	Detail
Rate	Up to 30–40% anatomical recurrence after native tissue repair (anterior colporrhaphy has the highest recurrence); lower after sacrocolpopexy (~10%)
Why	The surgery repairs the fascial defect, but the underlying predisposing factors (weak connective tissue, wide hiatus, ongoing risk factors like cough/obesity) persist. In all forms of pelvic organ prolapse, the primary problem is in the pelvic floor — NOT in the organ that has been displaced ^[3] — if the pelvic floor itself remains weak, the repair is under stress from day one
Prevention	Address modifiable risk factors (weight, cough, constipation); choose appropriate procedure for the defect; consider mesh augmentation via abdominal route (sacrocolpopexy) in women with collagen disorders or recurrent prolapse
After hysterectomy	Vaginal hysterectomy → remnant vault → but the problem is that vault can prolapse as well ^[5]. This is why vault suspension at the time of hysterectomy is critical

Type	Mechanism
De novo SUI	Prolapse repair unkinks the urethra → occult SUI becomes manifest. Remember the possibility of occult stress incontinence in case of severe prolapse ^[3]^[7]. This is why pre-operative urodynamics with prolapse reduced is essential — to detect and plan for concurrent anti-incontinence surgery
De novo urgency / Urge incontinence	Post-surgical inflammation, sutures near the bladder, or altered bladder position → irritative symptoms → detrusor overactivity. Usually transient but can persist
Voiding difficulty	Over-correction of anterior wall → urethral compression → new obstructive symptoms; or excessive elevation of bladder neck → kinking

Complication	Mechanism	Notes
Mesh erosion / Exposure	Mesh erodes through the vaginal mucosa → exposed mesh in the vaginal canal. Risk is higher with transvaginal mesh (10–15%) than with abdominal sacrocolpopexy mesh (~3–5%)	Presents with vaginal discharge, bleeding, pain, dyspareunia, or partner feeling the mesh during intercourse. Requires surgical excision of exposed mesh
Mesh contraction	Scar tissue forms around the mesh → mesh contracts and shrinks → pulls on surrounding tissues → chronic pelvic pain, vaginal shortening, dyspareunia	Difficult to treat; may require partial or complete mesh excision
Chronic pelvic pain	Mesh-related inflammation, nerve entrapment, or infection	Can be debilitating; this is the reason transvaginal mesh for POP has been restricted/banned (FDA 2019, NICE 2024)
Mesh infection	Bacterial biofilm forms on the mesh → chronic, low-grade infection resistant to antibiotics	May require mesh removal

Transvaginal Mesh vs Abdominal Mesh — Critical Distinction

The complications above are predominantly associated with transvaginal mesh kits (which have been restricted/banned). Abdominal mesh used in sacrocolpopexy has a much lower complication rate because: (1) the mesh is placed abdominally, not in direct contact with the thin vaginal mucosa, (2) it is separated from the vagina by layers of tissue, and (3) the surgical technique allows more precise placement. Sacrocolpopexy remains the gold standard for apical prolapse in fit patients.

Cause	Mechanism
Vaginal narrowing / Shortening	Over-aggressive colporrhaphy (especially posterior repair) → narrowed vaginal introitus → pain on penetration
Mesh erosion	Exposed mesh edges are rough and abrasive → pain for both patient and partner
Vaginal scarring	Post-surgical fibrosis → loss of vaginal elasticity → dyspareunia

This is a particularly important complication to counsel about, especially in sexually active women. The choice of surgical approach should consider the patient's desire for continued sexual function.

Complication	Mechanism
Cannot access cervix or endometrial cavity ^[5]	Close the vagina → in the future will not be able to do cervical smears or endometrial workup ^[5]. If cervical or endometrial malignancy develops after colpocleisis, diagnosis and treatment are significantly more challenging
Regret / Psychological impact	Loss of vaginal function is irreversible; some patients may regret the decision, particularly if their social circumstances change (new partner)
Urinary symptoms may persist	Colpocleisis treats the anatomical prolapse but does not directly address detrusor overactivity or sphincter weakness → some urinary symptoms may continue

Complication	Mechanism
Mesh erosion (~3–5%)	Lower than transvaginal mesh, but still possible
Sacral osteomyelitis / Discitis (very rare)	Infection at the sacral promontory fixation site
Small bowel obstruction	Adhesions from abdominal surgery; bowel entrapment under mesh
Prolonged operative time	3 hours ^[5] → higher risk of anaesthetic complications, VTE

Category	Complication	Key Point
Disease — Urinary	AROU, CROU, UTI, overflow incontinence, bladder stones, obstructive uropathy/renal failure	The "cascade of obstruction" — kinked urethra → stasis → infection/stones → back-pressure → renal damage
Disease — Vaginal	Desiccation, keratinisation, decubitus ulcer, bleeding, infection	Exposed mucosa; always biopsy persistent ulcers
Disease — Bowel	Obstructed defecation, faecal impaction, faecal incontinence	Rectocele traps stool; shared pelvic floor injury
Disease — Sexual	Dyspareunia, reduced satisfaction, avoidance	Impact on QoL and relationships
Disease — Psychosocial	Depression, social isolation, restricted activities	Not life-threatening but significant QoL impact
Pessary	Pressure ulcer, bleeding, infection, incarceration, fistula, expulsion	Regular review q4–6 months; topical oestrogen
Surgery — General	Haemorrhage, infection, VTE, urinary tract/bowel injury	Standard surgical risks
Surgery — Specific	Recurrence (most common!), vault prolapse, de novo SUI, mesh complications, dyspareunia	Recurrence up to 30–40% for native tissue repair

High Yield Summary

Complications of untreated POP follow a logical "cascade of obstruction": kinked urethra → incomplete emptying → residual urine → UTIs + bladder stones → chronic retention → overflow incontinence → hydronephrosis → obstructive uropathy → renal failure. Always check RFT and upper tract imaging if significant PVR/retention.

Vaginal mucosal complications: desiccation, keratinisation, decubitus ulcer (biopsy to exclude malignancy), bleeding, infection.

Pessary complications: pressure ulcer, bleeding, infection with discharge (the three from the lecture). Prevented by topical oestrogen + regular review q4–6 months.

Surgical complications: Recurrence is the most common (up to 30–40% for native tissue repair). Vault prolapse after hysterectomy is a specific risk (vault must be suspended). De novo SUI from unmasking occult incontinence — prevented by pre-operative urodynamics with prolapse reduced. Mesh erosion is a major issue for transvaginal mesh (restricted/banned); abdominal mesh in sacrocolpopexy has lower erosion rates.

Key counselling point: POP is not life-threatening but significantly affects quality of life. Not all symptoms will resolve with treatment. Expectations must be managed.

Active Recall - Complications of Pelvic Organ Prolapse

References

^[1] Senior notes: Maksim Surgery Notes.pdf (p156 – Overview of Hernias: definitions of incarceration, strangulation) ^[3] Lecture slides: GC 116. I felt a lump below urinary incontinence in females; genital prolapse.pdf (p6, p28, p38, p42, p44, p74) ^[5] Lecture slides: Block C - O&G Theme Case 4.pdf (p2, p5) ^[7] Lecture slides: Block C - I felt a lump below_ urinary incontinence in females; genital prolapse.pdf (p65) ^[8] Senior notes: Ryan Ho Urogenital.pdf (p159 – Urinary incontinence: types and complications of overflow incontinence) ^[13] Senior notes: Ryan Ho Fundamentals.pdf (p349–350 – AROU: causes including POP, overdistension mechanism) ^[19] Lecture slides: Block C - I felt a lump below_ urinary incontinence in females; genital prolapse.pdf (p33, p39, p40, p41) ^[20] Senior notes: Ryan Ho Urogenital.pdf (p172 – Complications of chronic retention in BOO: bladder stones, UTI, overflow incontinence, obstructive uropathy)

High Yield Summary

Definition: Pelvic organ prolapse (POP) is descent of pelvic organs through the vaginal canal due to failure of pelvic floor support. It may involve the bladder, uterus, vaginal vault, rectum, or small bowel.

Anatomy: DeLancey's levels are the key framework:

Level I: cardinal/uterosacral ligaments -> apical support -> uterine/vault prolapse.
Level II: pubocervical and rectovaginal fascia -> anterior/posterior wall support -> cystocele/rectocele.
Level III: perineal body and distal support -> urethrocele/perineal descent.

Risk factors — "PELVIC": Parity/vaginal delivery, Estrogen deficiency, Lifting/occupational load, Visceral pressure from obesity/cough/constipation, Inherent connective tissue weakness/age, Cutting from prior pelvic surgery.

Classification: By compartment:

Anterior: cystocele/urethrocele.
Apical: uterine prolapse or vault prolapse.
Posterior: rectocele or enterocele.

Symptoms: Vaginal lump/"something coming down," pelvic heaviness, urinary frequency/retention/SUI, obstructed defecation or splinting, dyspareunia, ulceration/bleeding in advanced prolapse.

Key association: POP and stress urinary incontinence share weak pelvic floor pathophysiology. Severe POP can mask occult SUI by kinking the urethra.

High Yield Summary — Diagnosis and DDx

Diagnosis is clinical: History + pelvic examination using Sims speculum + Valsalva, with POP-Q staging where possible. POP-Q uses the hymen as the reference point.

Clinically significant POP: Usually symptomatic prolapse with demonstrable descent, often POP-Q Stage II or above.

Basic investigations: Urinalysis/urine C/ST, bladder diary, post-void residual, RFT, fasting glucose, and KUB when retention/stones/faecal loading are relevant.

Pre-surgical/complex investigations:

Urodynamics: gold standard for lower urinary tract function; detects USI, detrusor overactivity, BOO, DUA, and occult SUI.
Pelvic ultrasound: rules out uterine/adnexal masses and assesses relevant pelvic pathology.
MRI/dynamic imaging: complex or recurrent multicompartment prolapse.

DDx of a vaginal/introital mass: POP, cervical polyp, prolapsed submucous fibroid, Bartholin cyst/abscess, urethral caruncle, vaginal/cervical malignancy, vaginal cyst. Exclude pregnancy in reproductive-age patients.

Rectocele vs enterocele: Rectocele is lower posterior wall and rectal finger enters the bulge; enterocele is upper posterior/apical and contains small bowel/omentum.

High Yield Summary — Management

Principles: Treat symptoms, start conservatively, optimise reversible risk factors, assess coexistent SUI, and use shared decision-making.

Acute urinary retention: Foley catheter, document drained volume, reduce prolapse, send urine C/ST, consider KUB, and use topical oestrogen if atrophic.

Conservative first-line:

Lifestyle: weight loss, treat chronic cough/constipation, reduce heavy lifting and caffeine.
PFMT: structured Kegel programme, usually 3 sets of 8-12 contractions held 8-10 seconds, TDS, for at least 15-20 weeks.
Ring pessary: mechanical support; review/change every 4-6 months.
Topical vaginal oestrogen: especially postmenopausal atrophy or pessary use.

Escalation: If pessary falls out, try a larger size, then consider two pessaries; persistent failure or complications -> surgery.

Surgery:

Anterior colporrhaphy for cystocele.
Posterior colporrhaphy for rectocele.
Vaginal hysterectomy + vault suspension for uterine/apical prolapse when appropriate.
Sacrospinous fixation or sacrocolpopexy for apical support; sacrocolpopexy is the gold-standard apical repair in fit patients.
Colpocleisis for elderly/frail patients who do not desire vaginal intercourse.

Before surgery: Test for occult SUI with prolapse reduced. If present, consider concomitant anti-incontinence surgery such as TVT or Burch colposuspension.

High Yield Summary — Complications

Untreated POP cascade: Cystocele/urethral kinking -> incomplete emptying -> residual urine -> recurrent UTI/bladder stones -> chronic retention -> overflow incontinence -> hydronephrosis -> obstructive uropathy/renal impairment.

Local complications: Vaginal desiccation, keratinisation, decubitus ulcer, bleeding, infection. Biopsy suspicious or non-healing ulcers to exclude malignancy.

Pessary complications: Pressure ulcer/erosion, bleeding, discharge/infection, incarceration if neglected. Prevent with correct sizing, topical oestrogen, and regular follow-up.

Surgical complications: Recurrence is common, especially after native tissue repair. Other risks include vault prolapse after hysterectomy without suspension, de novo SUI from unmasked occult incontinence, dyspareunia, voiding dysfunction, and mesh erosion when mesh is used.

Counselling point: POP is rarely life-threatening, but it can markedly affect quality of life. Not all urinary, bowel, or sexual symptoms resolve after anatomical correction.

Pelvic Organ Prolapse (pop)

Pelvic Organ Prolapse (POP)

2. Epidemiology

3. Anatomy and Function of the Female Pelvic Floor

4. Risk Factors

5. Aetiology and Pathophysiology

5.2 Pathophysiology by Compartment

6. Classification

6.2 By Severity — The POP-Q System (Pelvic Organ Prolapse Quantification)

7. Clinical Features

7.1 Symptoms

7.2 Signs (On Examination)

Active Recall - Pelvic Organ Prolapse (POP)

Differential Diagnosis of Pelvic Organ Prolapse (POP)

1. Differential Diagnosis of a "Lump at the Introitus / Vaginal Mass"

2. Differential Diagnosis of the Symptom Complex

5. Key Diagnostic Pitfalls and Associations

Active Recall - DDx of Pelvic Organ Prolapse

References

Diagnosis of Pelvic Organ Prolapse (POP) — Diagnostic Criteria, Algorithm and Investigations

3. The Clinical Examination — The Cornerstone of Diagnosis

4. Investigation Modalities

4.2 Tier 2: Specialised Investigations (Selected Patients)

Active Recall - Diagnosis of Pelvic Organ Prolapse

References

Management of Pelvic Organ Prolapse (POP)

4. Conservative (Non-Surgical) Management

5. Surgical Management

5.2 Reconstructive Surgery (Preserves Vaginal Function)

5.3.1 Colpocleisis

9. Special Considerations

Active Recall - Management of Pelvic Organ Prolapse

References

Complications of Pelvic Organ Prolapse (POP)

1. Complications of Untreated / Progressive POP

3. Complications of Surgical Treatment

3.2 Complications Specific to POP Surgery

Active Recall - Complications of Pelvic Organ Prolapse

References

On this page

Pelvic Organ Prolapse (pop)

1. Definition

2. Epidemiology

2.1 Prevalence and Burden

2.2 Hong Kong Context

2.3 Natural History

3. Anatomy and Function of the Female Pelvic Floor

3.1 Layers of Pelvic Support (From Superior to Inferior)

3.2 The Three Levels of Vaginal Support (DeLancey's Levels)

3.3 The Levator Ani — The Key Muscle

3.4 The Endopelvic Fascia and Ligaments

3.5 The Role of Oestrogen

3.6 Neurological Supply

4. Risk Factors

4.1 Obstetric Factors (Most Important)

4.2 Intrinsic / Constitutional Factors

4.3 Acquired / Extrinsic Factors (Increased Load)

4.4 Iatrogenic Factors

5. Aetiology and Pathophysiology

5.1 Aetiological Framework

5.2 Pathophysiology by Compartment

5.2.1 Cystocele (Anterior Compartment Prolapse)

5.2.2 Uterine Prolapse (Apical Compartment Prolapse)

5.2.3 Vault Prolapse (Post-Hysterectomy)

5.2.4 Rectocele (Posterior Compartment Prolapse)

5.2.5 Enterocele

5.3 Pathophysiological Mechanism Summary

6. Classification

6.1 By Compartment (Anatomical Classification)

6.2 By Severity — The POP-Q System (Pelvic Organ Prolapse Quantification)

POP-Q Reference Points

POP-Q Staging

6.3 Simplified/Older Grading (Shaw's Classification — for historical reference)

7. Clinical Features

7.1 Symptoms

7.1.1 Prolapse-Specific Symptoms (Vaginal Symptoms)

7.1.2 Urinary Symptoms (Anterior Compartment / Associated Pelvic Floor Dysfunction)

7.1.3 Bowel Symptoms (Posterior Compartment)

7.1.4 Sexual Symptoms

7.1.5 Associated Symptoms

7.2 Signs (On Examination)

7.2.1 General Examination

7.2.2 Pelvic/Vaginal Examination

7.2.3 Specific Tests During Examination

8. Relationship Between POP and Urinary Incontinence

9. Special Considerations in Hong Kong

Active Recall - Pelvic Organ Prolapse (POP)

References

1. Differential Diagnosis of a "Lump at the Introitus / Vaginal Mass"

1.1 Gynaecological Causes

1.2 Non-Gynaecological Causes

2. Differential Diagnosis of the Symptom Complex

2.1 DDx of Urinary Symptoms in a Woman with Suspected POP

2.2 DDx of Bowel Symptoms

2.3 DDx of Pelvic Heaviness / Dragging Sensation

3. Differentiating Between Compartments of POP

4. Differential Diagnosis Algorithm

5. Key Diagnostic Pitfalls and Associations

5.1 Occult Stress Incontinence

5.2 Coexisting Pelvic Pathology

5.3 Differentiating Rectocele from Enterocele

5.4 Differentiating Rectal Prolapse from Rectocele/Procidentia

Active Recall - DDx of Pelvic Organ Prolapse

1. Overview of the Diagnostic Approach

2. Diagnostic Criteria

3. The Clinical Examination — The Cornerstone of Diagnosis

3.1 Setting Up the Examination

3.2 Systematic Compartment Assessment Using Sims Speculum

3.3 POP-Q Measurement

3.4 Complementary Clinical Tests During Examination

4. Investigation Modalities

4.1 Tier 1: Basic/Bedside Investigations (All Patients)

4.2 Tier 2: Specialised Investigations (Selected Patients)

4.2.1 Uroflowmetry

4.2.2 Urodynamic Studies (UDS)

4.2.3 Pelvic Ultrasound

4.2.4 Imaging — CT / MRI

4.2.5 Cystoscopy

4.2.6 Defecating Proctography / Dynamic MRI

4.3 Tier 3: Pre-Surgical Assessment