Excluded gastric mucosa presenting as a polypoid tumor in the duodenal stump after B II resection.

We present endoscopic findings of a polypoid tumor in the duodenal stump after Billroth II partial gastric resection in a 61-year-old male. Histologic examination of the tumor revealed gastric mucosa of antral type. Accordingly, Congo red dyeing test failed to show acid secretion. The excluded antral mucosa did not gain any clinical significance in this patient since there was no history of peptic ulcer relapse within the 25 years after gastric operation.