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Urethroperineal Fistula

A urethroperineal fistula (UPF) is an epithelialized communication between the urethra and the perineal skin. It exists in two operationally distinct forms: a rare congenital posterior urethroperineal fistula (CUPF) — a urothelium-lined tract from the posterior urethra to the perineum, described in small case series — and acquired UPF that follows Fournier's gangrene, pelvic-fracture urethral injury, periurethral abscess, urethral stricture surgery, lichen sclerosus, or chronic catheterization.[1][2][3][4][5] After confirming an adequate orthotopic urethra, CUPF can often be treated by accessory-tract excision; acquired UPF requires assessment of infection, obstruction and tissue loss before selecting closure, urethroplasty, interposition or diversion. Perineal urethrostomy is an option for selected anterior urethral disease, provided the proximal outlet and bladder support it.

For the male-shaft equivalent and the broader interposition-flap framework, see Urethrocutaneous Fistula. For the operative principles of perineal-tissue reconstruction, see The Perineum and Fournier's Gangrene. For operative selection across all repair routes, see the Male Fistula Repair database.

Congenital Posterior Urethroperineal Fistula (CUPF)​

Definition​

A urothelium-lined tract between the posterior urethra and the perineum in a male — a rare urogenital anomaly. Published case counts are historical, not incidence estimates.[1][3]

Embryology​

Two competing models:[2][3][7]

  • Variant of Effmann Type IIA2 Y-duplication — but with a critical inversion: the dorsal (orthotopic) urethra is the functional channel and the ventral perineal tract is hypoplastic. Bello proposed designating CUPF as "Type IIA2, Y-hypoplastic ventral urethra."[3]
  • A distinct entity from urethral duplication, since the dorsal urethra is anatomically and functionally normal and the ventral channel is an accessory tract — excision has been successful after functional anatomy is confirmed, in contrast to hypospadiac urethral duplication where ventral excision can be catastrophic.[2]

Clinical presentation​

  • Perineal urinary leakage during or after voiding
  • Normal voiding through the penile meatus — the dorsal urethra is functionally intact[2]
  • Visible perineal opening between the scrotum and anus
  • Recurrent UTI[6]
  • Assess for rectal communication — a normal anus does not exclude an H-type rectourethral fistula[1]

Diagnostic discriminators — CUPF vs urethral duplication vs H-type RUF​

The critical distinction is which channel carries useful urinary flow. In reported CUPF, the orthotopic urethra is normal; in some Y-type duplications the ventral channel is essential. Rectourethral fistula requires demonstration of bowel communication. Establish the complete anatomy with imaging and endoscopy before sacrificing a channel; a perineal opening or normal-appearing anus alone is insufficient.[1][2]

Workup​

  • VCUG — opacifies both the normal dorsal urethra and the ventral perineal tract[2][6]
  • MRI pelvis — confirms the fluid-filled tract, increases in size during micturition; useful for surgical planning[6]
  • Cystourethroscopy — visualizes the internal opening of the fistula and confirms a normal dorsal urethra[2]
  • Fistulography — through the perineal opening[8]

Treatment and outcomes​

  • Excision of the ventral (accessory) channel through a perineal incision — the standard approach[2][3][8]
  • Endoscopic fulguration of the tract is an alternative[3]
  • High reported cure in small case reports/series; no population-level guarantee[2][3]
  • The single most important point: misdiagnosis as urethral duplication or rectourethral fistula leads to inappropriate and potentially catastrophic surgery — recognize CUPF before operating[1]

Acquired Urethroperineal Fistula​

Acquired fistulas vary from an isolated skin tract to extensive infected tissue loss or combined bowel and urinary injury.

Etiology​

SettingNotes
Fournier's gangreneNecrotizing fasciitis with urethral / periurethral debridement; suprapubic cystostomy in the acute phase; reconstruction delayed until wound is clean and granulating[9][10][11][21][22]
Pelvic fracture urethral injury (PFUI)Fistula forms when urethral continuity is not restored; often clusters with concurrent urethrorectal fistula[12][20][24][28][29]
Periurethral abscessStricture- or instrumentation-related abscess eroding through urethra and perineal skin
Urethral stricture / post-urethroplastyFistula formation is one of several possible complications; urethroplasty revision/stricture recurrence must not be counted as fistula incidence. Verla reported fistula as a high-grade complication in 4/85 (4.7%) adults undergoing repair of failed-hypospadias-related strictures[17][18][19]
Lichen sclerosus (BXO)Progressive panurethral stricture with tissue destruction; can present as a perineal/scrotal mass with a draining fistula; biopsy suspicious induration, ulceration or a mass to assess for SCC[13][14][15][25]
Urethral calculiChronic stone impaction eroding to the perineum; usually with stricture or long-term catheterization[4]
Neurogenic bladderDecubitus ulcers (33%), wound infection (24%), condom-catheter complications (19%), traumatic catheterization (19%) — 17/21 required permanent surgical or suprapubic-tube diversion in a selected urinary-cutaneous-fistula cohort[16]
TraumaPenetrating injury or blunt perineal injury; characterize the actual urethral and soft-tissue defect

Pathophysiology​

A common final pathway: urethral wall compromise (ischemia, necrosis, infection, inflammation, trauma) → loss of supporting spongiosal and fascial layers → cutaneous communication → epithelialization of a persistent tract. The likelihood of healing depends on drainage, obstruction, infection and tissue viability.

  • In Fournier's gangrene, debridement of necrotic tissue creates large defects that often expose or sacrifice urethra; suprapubic cystostomy is the acute urinary diversion of choice when debridement involves the urethra or periurethral tissues[9][10][21]
  • In PFUI, the membranous urethra is distracted from the bulbar urethra by pelvic ring disruption; if continuity is not re-established, urinary extravasation finds its way to a perineal wound or the surgical incision[24][29]
  • In lichen sclerosus, progressive inflammatory destruction produces dense fibrosis, panurethral stricture, and eventual fistulization through the perineum[13][14][15]

Clinical presentation​

  • Urinary leakage from a perineal opening
  • Perineal wetness, skin maceration, recurrent local infection
  • Obstructive voiding symptoms if a concurrent stricture is present; assess emptying even when symptoms are limited
  • Recurrent UTI
  • A perineal mass or induration in lichen sclerosus

Workup​

  1. Physical exam — opening(s), skin quality, scarring, available tissue for reconstruction
  2. RUG with VCUG when needed — map the fistula and associated stricture; VCUG adds proximal information when the outlet is nearly or completely obstructed[38]
  3. Cystourethroscopy — internal opening, urethral mucosa, distal obstruction
  4. MRI pelvis — adjunct for complex posterior anatomy, collections or unclear associated disease; a congenital MRI case report does not establish routine MRI for every LS-associated skin tract[6][38]
  5. Fistulography — through the perineal opening
  6. Biopsy — required when malignancy is suspected; obtain diagnostic LS histology when it would change management[38]

Management​

General principles (any acquired UPF)​

  1. Control sepsis and establish safe drainage promptly; time definitive repair after tissue inflammation and necrosis resolve, often over several months
  2. Identify and address distal obstruction before or with repair; tissue quality and infection also affect healing
  3. Manage the tract and diseased tissue according to its anatomy and the planned closure
  4. Watertight, tension-free urethral closure
  5. Consider vascularized coverage to separate suture lines, particularly with poor local tissue
  6. Reliable urinary drainage by a route appropriate to the repair
  7. The first repair offers the best chance of success — consider referral to a high-volume reconstructive center[26]

Conservative management​

A drainage trial may be considered for selected early leaks while treating infection and obstruction. The often-cited 15% spontaneous-closure estimate comes from a broad urogenital fistula review and should not be used as a specific UPF prognosis.[26]

Etiology-specific management​

A. Post-Fournier's-gangrene UPF​

The most challenging soft-tissue scenario.[9][10][11][21][22]

  • Acute phase: aggressive debridement, broad-spectrum antibiotics, suprapubic cystostomy for urinary diversion when urethra / periurethral tissue is involved, negative-pressure wound therapy
  • Reconstructive phase (delayed):
    • Split-thickness skin grafts for wound coverage[22]
    • Gracilis or VRAM flap may cover complex tissue defects; the cited 12-patient mixed urogenital-fistula series is not a Fournier-specific cure estimate[27]
    • Perineal urethrostomy may be suitable for extensive anterior urethral disease with a usable proximal urethra and bladder[21]
    • Permanent urinary diversion (suprapubic tube, ileal conduit) in the most severe cases

B. PFUI-associated UPF (often clustered with urethrorectal fistula)​

  • Transperineal anastomotic urethroplasty with tissue interposition is the standard approach[20][24][28]
  • When PFUI is associated with concurrent urethrorectal fistula, transperineal urethroplasty + gracilis interposition achieves 91% success (100% primary, 70% redo)[20]
  • Posterior urethroplasty for PFUI alone: 84% retreatment-free survival at 10 years[29]
  • Length-gaining maneuvers: bulbar mobilization, corporal separation, inferior pubectomy, urethral rerouting[24][29]
  • Severe PFUI/urethrorectal-fistula cohorts report substantial erectile dysfunction; these selected rates are not the expected incidence in all PFUI. Separate pre-existing trauma effects from de novo dysfunction after repair[12][29]

C. Post-urethroplasty / stricture-associated UPF​

  • Small fistulas — multilayer closure with dartos or tunica vaginalis flap interposition[5]
  • Complex with concurrent stricture — select anastomotic or substitution urethroplasty, sometimes staged; address the fistula as part of the reconstruction[18][19]
  • Recurrent or refractory — perineal urethrostomy (see below) is endorsed by the AUA Urethral Stricture Disease Guideline as a long-term option for high-risk reconstruction patients[23]

D. Lichen-sclerosus-associated UPF​

  • Genital skin must not be used for urethral reconstruction — it remains susceptible to LS recurrence[13][15]
  • Buccal mucosa is the graft of choice[13][14]
  • Oral-mucosa urethroplasty may be single-stage in suitable tissue or staged in complex disease; staging is not required for every LS stricture[14]
  • Definitive perineal urethrostomy is a reasonable durable option — 72% success at mean 56 months in one multicenter LS series, with many patients preferring this simpler endpoint[13][14]
  • Long-term follow-up and biopsy of suspicious lesions; diagnostic biopsy when it changes management[38]

E. UPF in neurogenic bladder​

  • In one selected cohort of 21 urinary-cutaneous fistulas, 17 required permanent surgical or suprapubic-tube diversion. Discuss options using the patient’s pressure, emptying, tissue and functional assessment; this is not a universal UPF failure rate.[16]

Tissue interposition options​

FlapSourceBest fitNotes
Gracilis muscle flapMedial thighComplex, irradiated, Fournier's defectsReliable medial-circumflex pedicle; long reach; workhorse[20][27]
VRAM flapRectus abdominisLarge pelvic / perineal defectsExcellent bulk and vascularity[27]
Dartos pedicled flapPerineal subcutaneous tissueModerate-complexity fistulasLocal, technically simple[30]
Bulbospongiosus muscle flapPerineal bulbospongiosusPFUI-associated, urethrorectal septumLocal, anatomically natural[28]
Rectus fascia graftLower abdominal wallRecurrent UPF (e.g., post-metoidioplasty)Autologous; separates suture lines[32]
Perivesical fat flapBladder domeSelected pelvic reconstructionsThe cited report concerns other urinary fistulas and salvage prostatectomy, not established isolated UPF efficacy[31]

Perineal urethrostomy as definitive management​

For selected complex anterior urethral strictures, including LS or failed hypospadias reconstruction, perineal urethrostomy is a possible definitive endpoint. The following results concern urethral-stricture populations, not isolated UPF. Neurogenic bladder alone is not an indication: storage pressure, emptying and functional proximal anatomy remain central.[23][33][34][35][36][37]

  • AUA Urethral Stricture Disease Guideline endorses perineal urethrostomy as a long-term option for high-risk patients[23]
  • Retreatment-free survival 84% at median 55-month follow-up; patient satisfaction high (median 21/24)[34]
  • A meta-analysis reported RR 0.93 (95% CI 0.84–1.03) for success compared with urethroplasty; heterogeneous nonrandomized data and a nonsignificant difference do not establish equivalence[35]
  • Use has risen from 4.3% of complex reconstructions in 2008 to 38.7% in 2017 — with 94.8% success vs 78.5% for BMG and 78.2% for skin flaps in that contemporary cohort[37]
  • Particularly appropriate for older patients with cardiovascular comorbidity, panurethral disease, or longer strictures; nearly half of patients undergoing first-stage Johanson refuse closure of the urethrostomy, suggesting it should be offered up front[36]

Outcomes​

EtiologyApproachSuccess
Congenital (CUPF)Simple excision or fulgurationHigh reported cure in small series; establish functional urethral anatomy first[1][2][3]
PFUI with rectal fistulaTransperineal urethroplasty + gracilisGuo: 29/32 overall, 22/22 without prior repair and 7/10 after prior failure; these are RUF-associated defects, not all skin fistulas[20]
Post-urethroplastyRepair with any needed urethral reconstructionUrethroplasty patency/revision rates are not isolated fistula-closure rates[5][18][19]
Lichen sclerosusOral-mucosa urethroplasty or selected perineal urethrostomyStricture-series outcomes do not establish UPF-specific closure success[13][14]
Fournier's gangreneGracilis/VRAM flap or perineal urethrostomyVariable; permanent diversion in severe cases[22][27]
Neurogenic bladderIndividualize repair or diversion17/21 diverted in one selected urinary-cutaneous cohort[16]

Operative Principles​

  • Recognize CUPF before operating — the dorsal urethra is normal; accessory-tract excision may be curative after functional anatomy is confirmed; misdiagnosis as urethral duplication or rectourethral fistula leads to inappropriate surgery[1][2]
  • Assess for concurrent stricture in acquired UPF — correct obstruction before or with repair[5][28][13]
  • Vascularized tissue interposition (gracilis, VRAM, dartos) is selected according to defect and tissue quality; the cited RUF/mixed-fistula series do not define every UPF repair[20][27][30]
  • Perineal urethrostomy is an option for selected anterior urethral disease with a functional proximal outlet; counsel separately about bladder dysfunction and other diversion options[23][34][36][37]
  • Biopsy suspicious lesions or obtain LS histology when it changes management[38]
  • First repair is the best repair — refer to an experienced reconstructive center[26]

See Also​

References​

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38. European Association of Urology. Urethral Strictures: Diagnostic Evaluation. 2026. Guideline chapter.