1) Extensive onocytic metaplasia 
Type: Term Pronunciation: on′kō-sī-tō′sis Definitions: 1. a spectrum of changes in the kidneys harboring oncocytomas. It includes multifocal oncocytic transformation of renal tubules, which may undergo cystic transformation, and infiltration of neoplastic oncocytes among tubules.
oncocytosis Extensive onocytic metaplasia.