Fournier's Gangrene Severity Index

Fournier’s gangrene is a rapidly progressive necrotizing fasciitis involving the perineum, genitalia, and perianal regions. The Fournier’s Gangrene Severity Index (FGSI) is a validated prognostic tool used at the time of admission to stratify disease severity and predict mortality risk. It enables clinicians to identify high-risk patients early, guide aggressiveness of management (e.g., ICU admission, early repeat debridement), and inform discussions regarding prognosis.

Fournier’s gangrene is typically polymicrobial, involving aerobic and anaerobic organisms that produce synergistic tissue destruction. Infection spreads along fascial planes (Colles’, Dartos’, Scarpa’s fascia), leading to microvascular thrombosis, ischemia, and rapid necrosis. Systemic toxicity results from sepsis, cytokine storm, and multiorgan dysfunction. FGSI captures this systemic derangement via physiological and laboratory abnormalities.