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An anal fistula is a small, hollow tunnel that develops between the end of the bowel and the skin of the anus. They usually form as a result of an infection or inflammatory condition near the anus causing a build up of pus in the nearby tissue. When the pus drains away, it can leave a small channel behind.
Surgery aims to get rid of the fistula, while protecting the sphincter muscles, which, if damaged, could cause incontinence.
Anal fistula surgery is often advised when experiencing any of the following symptoms: