Abstract
Colitis cystica profunda is a rare benign disease of the colon and rectum, characterized by immigration of the mucosa into the submucosa and formation of the mucocele. We report a case of colitis cystica profunda. A 26-year-old man was seen at the hospital because of bloody stool passage. Total colonoscopy revealed a tender polypoid lesion with a central depression on the anterior rectal wall 5cm from the anal verge. The lesion was so tender that it was easily flattened by the air sent from a colonoscope. Histological features from the biopsy specimens could not rule out a possibility of well differentiated mucinous adenocarcinoma. The diagnosis of colitis cystica profunda was confirmed with intraoperative transanal resection of the whole lesion.
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