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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, or fistula-in-ano, is a chronic abnormal communication between the epithelialised surface of the anal canal and (usually) the perianal skin.Anal fistulae originate from the anal glands, which are located between the internal and external anal sphincter and drain into the anal canal.nal fistula, or fistula-in-ano, is a chronic abnormal communication between the epithelialised surface of the anal canal and (usually) the perianal skin. Anal fistulae originate from the anal glands, which are located between the internal and external anal sphincter and drain into the anal canal.