Glandular Neoplasia of the Sinonasal Tract.

Glandular lesions that cannot be diagnosed readily as salivary gland tumors occur uncommonly in the upper aerodigestive tract. They occur only with some frequency within the sinonasal tract. Well-characterized lesions at this site include the respiratory epithelial adenomatoid hamartoma, seromucinous hamartoma, and intestinal and non-intestinal-type adenocarcinomas. This article reviews the clinicopathologic features of these fascinating lesions.