title: Multicystic renal oncocytoma.
abstract: The usual gross appearance of a renal oncocytoma is that of a well-circumscribed homogeneous tan-brown tumor with no evidence of necrosis or hemorrhage, but with a central fibrous scar. We describe a case of renal oncocytoma with the unusual gross appearance of a cystic tumor. While cystic change has occasionally been mentioned in an oncocytoma to our knowledge, this degree of cyst formation has not previously been described.
mesh_terms: D000236:Adenoma / Q000473:pathology*; D000368:Aged; D003937:Diagnosis, Differential; D006801:Humans; D007680:Kidney Neoplasms / Q000473:pathology*; D008297:Male; D007690:Polycystic Kidney Diseases / Q000473:pathology*