Kidney - Renal Tubule - Hyperplasia, Oncocytic
Oncocytic hyperplasia is characterized by tubule cells having lightly staining and finely granular cytoplasm with centralized nuclei. Oncocytic hyperplasia is a rare lesion in the rat and mouse (Figure 1) and reportedly originates in the collecting tubule. Ultrastructurally, oncocytes are composed of atypical mitochondria. Oncocytic hyperplasia is difficult to separate from oncocytoma and should be scored separately from other hyperplastic lesions of the renal tubule.
Oncocytic hyperplasia should be diagnosed and given a severity grade.
Frazier KS, Seely JC, Hard GC, Betton G, Burnett R, Nakatsuji S, Nishikawa A, Durchfeld-Meyer B, Bube A. 2012. Proliferative and non-proliferative lesions in the rat and mouse urinary system. Toxicol Pathol 40:14S-86S.Abstract: http://www.ncbi.nlm.nih.gov/pubmed/22637735