Anal fistula classification

Anal fistula Microchapters
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1] Associate Editor(s)-in-Chief: Manpreet Kaur, MD [2]

Classification

Anal fistulas are classified into the four types based on the location of sphincter:

• Intersphincteric: Starts from dentate line ending in the perianal skin.
• Transsphincteric: Starts from the external sphincter, going along a portion of the internal and external sphincter and ending in the skin overlying buttocks.
• Suprasphincteric: Starts from the anal crypt and ends in the ischiorectal fossa.
• Extrasphincteric: Starts high in the anal canal and ending in the skin overlying the buttocks.