Pyloric gland adenoma of gallbladder-reports of two cases and a brief review of literature.

Adenomas of the gallbladder are uncommon benign epithelial neoplasms. Rarely, they can give rise to gallbladder cancer, which is the most common malignancy of the biliary tract, carrying a poor prognosis and decreased survival. Here we report the case histories of two patients, 40-year-old and 53-year-old males who presented with >1 cm gallbladder polyps, which were detected and confirmed using various imaging studies. Cholecystectomy was performed on both patients and the subsequent pathologic exam revealed 1.2 and 1.6 cm polyps in the lumen. Histopathologically, both polyps showed features reminiscent of "pyloric" gland type of adenoma. The differences between the two cases in regard to histopathological and immunohistochemical characteristics will be discussed. We will also briefly review the latest nomenclature on such low-grade polypoid gallbladder entities.