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Case Reports
Journal Article
Research Support, Non-U.S. Gov't
Pancreatic endocrine tumor with partial acinar cell differentiation.
We examined a 70-year-old woman in whom a pancreatic endocrine tumor with partial acinar cell differentiation had been diagnosed. She had neither endocrine nor exocrine symptoms. The tumor was located in the pancreatic tail and measured 12.5 x 9.5 x 8 cm. It had a capsule, was composed of multiple adhesion nodules, and was elastically soft, medullary, and yellowish white. The neoplastic cells had large, irregular, oval nuclei; prominent eosinophilic nucleoli; and abundant eosinophilic cytoplasm with many fine granules. The cells had proliferated in islet-like solid medullary, trabecular, acinar, and papillary patterns. Most neoplastic cells were strongly positive for synaptophysin. 10 to 25% of the neoplastic cells were positive for alpha1-antitrypsin. Neuroendocrine and zymogen granules were simultaneously observed in the cytoplasm of the same neoplastic cells at the ultrastructural level. The tumor may be considered an amphicrine tumor.
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