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A seton (silk string or rubber band) is used to either create scar tissue around part of the sphincter muscle before cutting it with a knife allow the seton to slowly cut all the way through the muscle over the course of several weeks the seton may also aid in the drainage of the fistula. Anal fistula 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. Anal fistulae commonly occur in people with a history of anal abscesses. Benign diseases of the anal and perianal region study guide by clew48 includes 55 questions covering vocabulary, terms and more. Quizlet flashcards, activities and games help you improve your grades. This is often the first part of treatment requiring several stages. Secondary surgery once a seton is in place the fistula is usually controlled but this does not result in a cure and some discharge will remain. Further surgery may be needed and there are a variety of options available. The seton is pulled tight so it will slowly cut through the tissue around the fistula and leave scar tissue in its place. One of the most common treatment methods for fistula-in-ano, a fistulotomy is a surgical procedure in which the fistula channel is cut open.