Adenosquamous carcinoma of the sigmoid colon: a case report and review of literature.

Adenosquamous carcinoma of the colon consisting of both glandular and squamous histopathologic features is a rare colorectal neoplasm. Metastasis commonly occurs in right and transverse colon. A 71-year-old Caucasian man presented with a four-month history of intermittent rectal bleeding. Pathologic analysis of biopsy specimen revealed an adenosquamous carcinoma of sigmoid colon. Sigmoid resection with a proximal and distal resection was performed. Early detection and radical operation with other available therapeutic modalities may improve clinical outcome.