Hyperplastic fundic gland polyp of the stomach.

A case of a solitary pedunculated gastric polyp occurring in the fundic mucosa of a 47-year-old woman is reported because of its unique morphology. The polyp showed a peculiar lobulated configuration supported by smooth muscle bundles, and its epithelial component was composed mainly of a proliferation of relatively normal but disorganized fundic glands containing variable numbers of mucous, parietal, argyrophile, and chief cells. Although these histologic features may suggest a hamartoma-like quality, the lesion probably represents a peculiar form of localized hyperplastic process of the gastric mucosa exhibiting fundic glandular cell differentiation.