title: Mixed hyperplastic and adenomatous polyp arising from ectopic gastric mucosa of the duodenum.
abstract: We report an unusual case of a polyp arising from ectopic gastric mucosa in the duodenum. The polyp demonstrated both hyperplastic and adenomatous proliferation. Adenomatous proliferation in a duodenal polyp arising from ectopic gastric mucosa is, to our knowledge, unique. The areas of adenomatous change were morphologically indistinguishable from those of adenomatous polyps arising in the stomach; hence, the adenomatous change observed in this polyp was regarded as a neoplastic process.
mesh_terms: D000368:Aged; D002828:Choristoma / Q000473:pathology*; D004379:Duodenal Neoplasms / Q000473:pathology*; D005260:Female; D005753:Gastric Mucosa; D006801:Humans; D007417:Intestinal Polyps / Q000473:pathology*