This case details the development of a rapidly growing polypoid mass in the proximal stomach in a patient with known attenuated familial adenomatous polyposis. Surgical resection was required and histology showed hyperplasia with extensive areas of dysplastic adenomatous change. This case illustrates that patients with the attenuated form of familial adenomatous polyposis are at risk for multiple neoplasia distinct from those patients with the classic form of familial adenomatous polyposis. (C) 2000 by Am. Coll. of Gastroenterology.
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