Can renal oncocytomas be distinguished from renal cell carcinoma on fine‐needle aspiration specimens?

The reliability of using fine‐needle aspiration (FNA) to distinguish renal oncocytoma (RO), a benign tumor, from renal cell carcinoma (RCC), which has eosinophilic granular cytoplasm, has been questionable. However, it is clinically significant, because radical nephrectomy may be avoided in patients with RO. The authors retrospectively studied the cytologic features and ancillary study findings of RO compared with findings in RCCs with eosinophilic granular cytoplasm to evaluate the reliability of FNA‐based diagnosis of RO.

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