Oncocytic and oncocytoid tumors of the exocrine pancreas, liver, and gastrointestinal tract.

Tumors having typical oncocytic features very rarely affect the gastrointestinal (GI) tract, liver, and pancreas, although several tumors with prominent "pink" (eosinophilic) cytoplasm are recognizable in the digestive tract. From a practical point of view, interest in the former lesions is limited to the differential diagnosis of a primary neoplasm versus metastatic deposits of malignant oncocytic tumors from other sites. This article briefly reviews the diagnostic features and clinical significance of the currently known tumors of the alimentary tract displaying a prominent oxyphilic character.