Adenosquamous carcinoma of the sigmoid colon: report of a case.

A case of adenosquamous carcinoma of the sigmoid colon is presented herein. An 85-year-old woman without any symptoms was admitted to our hospital to undergo detailed examinations of the colon and rectum. Colonoscopy showed a huge type 2 tumor in the sigmoid colon. A typical sigmoid colectomy and lymph node dissection were performed. A histopathological investigation demonstrated adenosquamous carcinoma invading the subserosa. Although an absolute curative resection was performed, she died of metastatic lung carcinoma 14 months after the operation.