oncocytoma


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  • Clinical

    • asymptomatic
    • incidental finding

  • Gross

    • mahogany brown
    • central stellate scar in 33%

  • Histology

    • architecture: nests, acini, tubules or microcysts
    • oncocyte cytology: round/polygonal, granular eosinophilic, central nucleoli
    • stroma: hyalinized

  • Stains

    • positive: CD15 (100%), Ecad (100%), galectin (96%), CD117 (90%)
    • negative: RCC (0%), napsin (0%)
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