Hemorrhagic Papillary Necrosis
Hemorrhagic Papillary Necrosis

The dark hemorrhagic areas are renal papillae that are necrotic.
The overlying cortical tissue is relatively spared by the necrotizing process, especially in the mid lower field of the photograph.
(Description By:H. Yamase, M.D. )
(Image Contrib. by: UCHC )