Sandbox: DDx Kidney mass

• 40 yo patients

• Abdominal pain
• Hematuria
• Palpable mass
• Polycythemia symptoms

Arrangement of monotonous small blue embryonal epithelial cells Acinar, tubular, or sheetlike configuration Psammoma bodies Vimentin, pancytokeratin and cytokeratin-19

Nonmalignant causes

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