Abstract

Oncocytoma is a common benign kidney tumor. The size is often less than 5 cm. Oncocytomas may be misdiagnosed in clinic, radiology and histopathology for renal cell carcinoma. Different panels of immunohistochemistry (IHC) are suggested in the renal tumors with eosinophilic granular cytoplasm including oncocytoma, chromophobe and clear renal cell carcinoma. Here we report a large oncocytoma in a 64-year-old lady, that the mimickers ruled out by IHC.

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