A Case of Mucoepidermoid Carcinoma of the Anal Canal

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  • 粘表皮癌と診断された肛門管癌の1例

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Abstract

We report a case of mucoepidermoid carcinoma of the anal canal. A 66-year-old man was admitted to our hospital complaining of anal pain and hematochezia. Contrast-enhanced computed tomography showed an enhanced tumor, 60 mm in size, from the anus to the lower part of the rectum, and in addition, the right inguinal lymph node was swollen. Colonoscopic examination revealed a submucosal tumor-like lesion with central ulceration in the anal canal. The biopsy specimen suggested mucoepidermoid carcinoma, and abdominoperineal resection with D3 lymphadenectomy including the right inguinal lymph node was performed. Gross examination of the resected specimen revealed an ulcerated tumor, 60 mm × 60 mm in size, from the perianal skin to the lower part of the rectum. Pathological examination resulted in mucoepidermoid carcinoma, pA, int A, INFb, ly0, v1, pN2(5/24). No recurrence has been found for 2 years post-operation. Mucoepidermoid carcinoma is a rare histological type of anal cancer, and this case presented an interesting morphological type.

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