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Renal oncocytoma is a benign renal neoplasm that makes up 6% to 9% of all renal tumors. It is usually asymptomatic and is most often discovered incidentally on imaging studies performed for unrelated conditions. The tumor is usually well-circumscribed but not encapsulated. It has characteristic mahogany brown or yellow-brown color. A prominent central stellate scar is seen in about 30% of cases, usually in larger tumors. Image courtesy of Dr. Jean-Christophe Fournet, Paris, France; humpath.com; Used with permission.

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