The American Association for the Surgery of Trauma (AAST) reported criteria for the grading of perirectal abscess.
Parameters:
(1) location of the abscess
(2) additional clinical features
Clinical features: fever, perineal pain with or without swelling, tenderness, with positive culture
Imaging studies: MRI preferred but endorectal ultrasound or CT can demonstrate
Location
Additional Clinical Features
Grade
perianal abscess
localized pus
I
intersphincteric or ischiorectal abscess
II
horseshoe abscess
III
supralavator abscess
IV
necrotizing soft tissue infection (Fournier's gangrene)
necrotic skin and soft tissue; gas in soft tissue
V
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Specialty: Infectious Diseases
