BACKGROUND: The case of a benign oncocytoma arising in a patient from retroperitoneal heterotopic adrenocortical tissue is reported; this tumor was found in a 44-year-old man. METHODS: The tumor consisted of polygonal cells with granular eosinophilic cytoplasm packed with swollen mitochondria. RESULTS: Scattered tumor cells showed abundant smooth endoplasmic reticulum suggesting that the tumor was of adrenocortical origin.
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Nguyen et al. (1992) studied this question.
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