Sandbox: DDx Kidney mass

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50-60 yo male Asymptomatic Incidental finding on imaging May have hematuria and flank pain Palpable flank mass

Nonmalignant causes

anaplastic sarcoma clear cell sarcoma mesoblastic nephroma metanephric stromal tumor nephroblastomatosis / nephrogenic rests neuroblastoma oncocytoid carcinoma after neuroblastoma ossifying