Ampullary carcinoma associated with multiple duodenal villous adenomas.

A 39-year old Asian with multiple duodenal villous adenomas and an adenocarcinoma arising from one of these tumors is described. The rarity of villous adenomas at this site is stressed and their tendency to undergo malignant change reviewed. Immunoperoxidase studies using carcinoembryonic antigen (CEA) antiserum were positive in high dilutions (1 in 8,000) in the carcinoma and the largest adenoma. This stain would appear to show functional malignancy before histological evidence of malignancy is found.