page_title: Renal oncocytoma
section_title: Diagnosis
hierarchical_section_title: Renal oncocytoma / Diagnosis
caption_attribution_description: English: Gross appearance of the cut surface of a nephrectomy specimen containing a renal oncocytoma.
context_page_description: A renal oncocytoma is a tumour of the kidney made up of oncocytes, a special kind of cell.
context_section_description: In gross appearance, the tumors are tan or mahogany brown, well circumscribed and contain a central scar. They may achieve a large size (up to 12 cm in diameter).
  The main differential diagnosis of renal oncocytoma is chromophobe renal cell carcinoma oncocytic variant, which like the renal oncocytoma has eosinophilic cytoplasm, but has perinuclear clearing and, typically, some degree of nuclear atypia.
caption: Gross appearance of a renal oncocytoma (left of image) and a slice of a normal kidney (right of image). Note the rounded contour, the mahogany colour and the central scar.
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