A duodenal tumor was found in a 68-year-old woman undergoing routine cholecystectomy for chronic cholecystitis associated with cholelithiasis. Microscopically, the tumor contained glandular structures and psammoma bodies. Electron microscopic examination demonstrated numerous intracytoplasmic neurosecretory granules consistent with endocrine D cells. Immunoperoxidase staining for somatostatin was positive in the tumor cells. The tumor appeared to be different from the somatostatinomas reported in the literature in that it was nonfunctional, located in the duodenum, and associated with psammoma bodies.
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