Sandbox: DDx Kidney mass
- 1-2 yo patients
- Constitutional symptoms
- May have abdominal pain, constipation, proptosis, periorbital ecchymoses, back pain, weakness, hypertension, and subcutaneous nodules
- Opsoclonus myoclonus ataxia syndrome
- Heterogeneous mass on U/S
- Internal vascularity
- Necrosis
- Calcification
- Elevated levels of catecholamines, dopamine, homovanillic acid, and vanillylmandelic acid (VMA)
- Small round blue cells
- Thin pink fibrous septa
- Homer-Wright rosettes
- Neuropil-like stroma
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)