Bilateral renal oncocytosis with renal failure.

Oncocytosis is a term recently used to describe diffuse renal involvement by numerous oncocytic nodules. We report herein a case of a 53-year-old man with end-stage renal disease requiring hemodialysis. His kidneys were involved by numerous tumors. Histologic examination revealed more than 100 oncocytomas and an associated papillary renal cell carcinoma in the right kidney.