Fournier's gangrene
Necrotizing fasciitis of the perineum, where the skin lies about how sick the patient is. Pain out of proportion, septic physiology without an obvious source — and a mortality that climbs with every hour you wait for a scan.
The one-liner
The OR is the diagnostic test. Broad-spectrum antibiotics within 1 hour, resuscitate, and debride within hours — every hour of delay raises mortality. Negative imaging does not rule it out; clinical suspicion drives the knife.
Fournier’s gangrene is the emergency where the surface lies to you. The skin can look bland and erythematous while the fascia beneath it is dying and the patient is septic. The hallmark is pain out of proportion to what you see, and the only test that matters is the one you do in the operating room.
The frame
This is polymicrobial necrotizing fasciitis of the perineum and genitals, spreading along Colles’ fascia onto the abdominal wall. It spares the testes — their blood supply comes separately from the aorta — which is a clue, not an exclusion. The systemic signature is the giveaway: septic physiology without an obvious surgical source. Diabetes, immunocompromise, a recent perineal procedure, or an indwelling catheter all raise the index of suspicion.
What everyone gets wrong
Waiting for imaging to be sure. CT can show subcutaneous gas, fascial thickening, and fluid tracking — and if it’s fast and adds confidence, fine. But negative imaging does not rule it out, and crepitus on exam is a late, specific finding you cannot wait for. The LRINEC score is a flag (≥6 concerning, ≥8 high probability), but a low score never overrides a worried clinician. The OR is the test.
The sequence, against the clock
Mortality climbs measurably with every hour of delay, so these run in parallel, not in series:
- IV access, cultures, lactate, LRINEC.
- Broad-spectrum antibiotics within 1 hour — pip-tazo + vancomycin + clindamycin (clinda for antitoxin effect).
- Resuscitate — 30 mL/kg crystalloid, pressors as needed.
- OR for debridement within hours — and back to re-look every 24–48 hours until there is no further necrosis to take.
The diversions
- Diverting colostomyif there’s perianal involvement or fecal contamination of the wound.
- Suprapubic urinary diversion if the urethra is involved.
- Reconstruction — STSG, scrotal advancement, flaps — is a planning problem for once the wound is stable, not a same-night decision.
If you remember one thing
Don’t let bland skin or a reassuring scan buy time the patient doesn’t have. Pain out of proportion plus septic vitals is enough to mobilize the room. In Fournier’s, the knife is the diagnosis.