A case of multiple basaloid carcinomas of anal canal

Abstract

A 66-year-old woman was admitted to our hospital because of constipation and difficulty in defecating. She underwent abdominoperineal resection and lymphnode dissection following a diagnosis of poorly differentiated adenocarcinoma. A resected specimen contained two tumors and each tumor was separated. Histopathological examinations of both tumors diagnosed basaloid carcinoma. Basaloid carcinoma is an uncommon neoplasm of the anal canal, and the incidence of this tumor is reported to be 1.6 % of all anal canal neoplasms in Japan. Only two cases were reported with multiple lesions. Recently, this tumor has been reported to respond well to chemoradiation therapy, therefore it is important to diagnose precisely before treatments.