Sandbox: DDx Kidney mass

1-2 yo patients Abdominal mass May have abdominal pain, constipation, proptosis, periorbital ecchymoses, back pain, weakness, hypertension, and subcutaneous nodules Opsoclonus myoclonus ataxia syndrome

Nonmalignant causes

anaplastic sarcoma clear cell sarcoma mesoblastic nephroma metanephric stromal tumor nephroblastomatosis / nephrogenic rests neuroblastoma oncocytoid carcinoma after neuroblastoma ossifying tumor renal cell carcinoma rhabdoid tumor translocation carcinoma (children)