Presentation
Right renal mass - no clinical symptoms.
Patient Data
Age: 40 years
Gender: Female
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Right kidney with well circumscribed tan tumor, 100mm in diameter, in the upper pole. There is a central stellate scar and macroscopic hemorrhage.
From the case:
Renal oncocytoma (pathology)
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(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).