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Anal Ulcer
Definition 1
A painful tear in the lining of the anal canal, often accompanied by bleeding on defecation. It is usually the result of a traumatic bowel movement or anal sexual penetration. (NCI Thesaurus)
Definition 2
A disorder characterized by a circumscribed, inflammatory and necrotic erosive lesion on the mucosal surface of the anal canal. (NCI Thesaurus/CTCAE)
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