Renal oncocytoma (pathology)

Case contributed by Dr Andrew Ryan

Presentation

Right renal mass - no clinical symptoms.

Patient Data

Age: 40 years
Gender: Female

Right radical nephrectomy performed

Pathology

Right kidney with well circumscribed tan tumor, 100mm in diameter, in the upper pole. There is a central stellate scar and macroscopic hemorrhage.

Pathology

(H&E x40)  - Sections from scar showing fibrosis (left 1/3 of picture) and osseous metaplasia. Hematopoiesis was present within the medullary space on higher power.  

(H&E x200) - Uniform tumor cells with rounded nuclei and eosinophilic, partly vacuolated cytoplasm (the latter is a variant finding with oncocytoma cells usually showing uniform eosinophilic cytoplasm).

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