Multicentric early adenocarcinoma involving stomach and duodenum.

Six separate foci of superficial adenocarcinoma were seen in the first part of the duodenum of a 53-year-old man with a multicentric superficial adenocarcinoma of the stomach. To our knowledge, duodenal involvement in such a tumor has not been reported before. The duodenal foci were partly covered by gastric-type surface epithelium, suggesting that they might have arisen in areas of gastric metaplasia or heterotopia.