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A needle aspirate biopsy of a parotid neoplasm yielded uniform benign oncocytic cells consistent with oncocytoma. The subsequent surgical specimen demonstrated an oncocytic carcinoma with vascular and perineural invasion. These findings are analogous to those of oxyphilic tumors of the thyroid gland where cytologic features often do not allow for distinction between benign and malignant lesions.

The cytologic findings of a fine-needle aspiration biopsy of a renal cell adenocarcinoma with massive intracellular hemosiderin accumulation are described. These findings have not been previously illustrated in the cytology literature. These features could also be observed in fine-needle aspiration biopsies of renal cell adenocarcinoma metastases.