An abnormal channel connecting the inside of the anal canal with the skin surrounding the anus. An anal fistula may be an indication of Crohn’s disease, colitis, or cancer of the colon or rectum (see colon, cancer of; rectum, cancer of). In most cases, it results from an abscess that develops for unknown reasons in the anal wall. The abscess discharges pus into the anus and out on to the surrounding skin. An anal fistula is treated surgically by opening the abnormal channel and removing the lining. The wound is then left to heal naturally.
Anal fistula |
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