1990 Volume 51 Issue 7 Pages 1536-1540
It is uncommon that an adenoma primarily arises in an artificial anus. We encountered such a rare case in a 56-year-old male who underwent Miles' operation for rectal cancer in 1975 and right hemicolectomy for cecal cancer in 1977-Both resections were curative and no signs of recurrence were observed after the operations. The patient visited our hospital because of hemorrhage from the artificial anus in 1987, and a thumb tipsized mass found at the site. Carcinoma in adenoma was diagnosed via biopsy. The artificial anus was dissected from the surrounding tissues and circumcised at 1cm from the oral margin of the tumor. Pathohistological examination revealed a mucous cancer extending to the submucosa at the center of the adenoma. Adenoma arising in the artificial anus has only been reported in three cases of ulcerative colitis and one case after Miles' operation. It has not been reported that a carcinoma in adenoma has arisen in the artificial anus like this case.
