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Horseshoe fistula is one of the most. complex and potentially morbid. conditions faced in a modern anorectal. surgery. Hanley, 1965 reported his. original procedure for horseshoe fistula. which involved complete division of the. posterior 12 o'clock sphincter mechanism.
Anal fistula. Anal fistula (plural fistulae), or fistula-in-ano, is a chronic abnormal communication between the epithelialised surface of the anal canal and (usually) the perianal skin. An anal fistula can be described as a narrow tunnel with its internal opening in the anal canal and its external opening in the skin near the anus.