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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.
A gastrointestinal fistula is an abnormal opening that allows the contents of the stomach or intestines to leak. 1  If it leaks through to a part of the intestines, it is called an entero-enteral fistula. 2  If it leaks to through to the skin, it is called an enterocutaneous fistula.ack to Top Causes. Most gastrointestinal fistulas occur after surgery. Other causes include: 1  Gastrointestinal obstruction. 2  Inflammatory processes, such as infection or inflammatory bowel disease (most often Crohn's disease).