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== Epidemiology ==
*Uncommon condition
*High morbitidy
*Men (2:1)
*Young adults
== Technique ==
*Enhancement sequence: T1 FS
== Types Anatomy == == Classification == St. Jame's classification* Type 1: simple linear intersphincteric fistula* IntersphinctericType 2: intersphincteric fistula with abscess or secondary tract* TranssphinctericType 3: trans-sphincteric fistula* SuprasphinctericType 4: trans-sphincteric fistula with formation of abscess or secondary tract within the ischioanal fossa* ExtrasphinctericType 5: suprasphincteric or extrasphincteric fistula
== Complexity==
