Anorectal fistula: Clinical manifestations, diagnosis, and management principles
- Elizabeth Breen, MD
Elizabeth Breen, MD
- Assistant Professor of Surgery
- Harvard Medical School
- Ronald Bleday, MD
Ronald Bleday, MD
- Associate Professor of Surgery
- Harvard Medical School
An anorectal fistula is the chronic manifestation of the acute perirectal process that forms an anal abscess . When the abscess ruptures or is drained, an epithelialized track can form that connects the abscess in the anus or rectum with the perirectal skin .
The true prevalence of anal fistulas is unknown, as anorectal discomfort is often attributed to symptomatic hemorrhoids. The incidence of an anal fistula developing from an anal abscess ranges from 26 to 38 percent [3-5]. The mean age for presentation of anal abscess and fistula disease is 40 years (range 20 to 60) [6-9]. Adult males are twice as likely to develop an abscess and/or fistula compared with women [1,9].
The most common etiology of an anorectal fistula is an anorectal abscess. (See "Perianal and perirectal abscess".)
Other causes of anorectal fistulas include:
●Crohn’s Disease – Fistulas complicating Crohn's disease or other intra-abdominal inflammatory processes may be accompanied by associated bowel symptoms such as diarrhea and abdominal pain. Anorectal fistulas preceding other clinical manifestations of Crohn's disease are uncommon. As an example, in one surgical series of 136 patients with Crohn's disease, fistulas preceded the intestinal manifestations of the disease in only six patients (5 percent) . (See "Perianal complications of Crohn disease".)
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