Oncocytoma : Degenerative Atypia
Section Editor: Dharam M. Ramnani, MD
Virginia Urology, Richmond, VA, USA
Image Description
Focal atypia of degenerative type is quite common in oncocytomas. It consists of marked nuclear hyperchromasia and pleomorphism. However, there is no increase in mitotic activity and Ki-67 labeling index. Note the sharp demarcation between zones of degenerative atypia and usual morphology.