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| | eMedicine - Anal Fissure : Article by Lisa S Poritz, MD |
 | | Problem: An anal fissure is a painful linear tear or crack in the distal anal canal, which, in the short-term, usually involves only the epithelium and, in the long-term, involves the full thickness of the anal mucosa (see Images 1-2). |
 | | Etiology: The exact etiology of anal fissures is unknown, but the initiating factor is thought to be trauma from the passage of a particularly hard or painful bowel movement. |
 | | The fibers of the internal anal sphincter are visible in the base of the chronic fissure, and often, an enlarged anal skin tag is present distal to the fissure and hypertrophied anal papillae are present in the anal canal proximal to the fissure. |
| www.emedicine.com /med/topic3532.htm (3552 words) |
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