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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.
By Sally Robertson, BSc. A fistula is an abnormal, tube-like connection that forms between two organs or vessels that are lined with epithelial cells. Fistulas are generally the result of a disease condition, but artificial fistulas may also be surgically created for therapy.istulas may also form between the rectum and the vagina and this is called a rectovaginal fistula. Although fistulas are usually caused by injury or surgery, they may also form after an infection has led to severe inflammation.