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Anorectal fistula: Clinical manifestations, diagnosis, and management principles

Authors
Elizabeth Breen, MD
Ronald Bleday, MD
Section Editor
Martin Weiser, MD
Deputy Editor
Wenliang Chen, MD, PhD

INTRODUCTION

An anorectal fistula is the chronic manifestation of the acute perirectal process that forms an anal abscess [1]. 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 [2].  

EPIDEMIOLOGY

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].

ETIOLOGY

The most common etiology of an anorectal fistula is an anorectal abscess. (See "Perianal abscess: Clinical manifestations, diagnosis, treatment".)

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) [10]. (See "Perianal complications of Crohn disease".)

           

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Literature review current through: Nov 2016. | This topic last updated: Mon Jun 08 00:00:00 GMT+00:00 2015.
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