Sandbox: DDx Kidney mass
- 50-70 yo males
- Asymptomatic
- Incidental finding
- Palpable flank mass
- Papillary foamy macrophages
- Intracellular hemosiderin
- Size 7 cm
- Heterogeneous, multifocal, well-circumscribed, mass on CT
- Less intense contrast enhancement
- Calcification
- Papillary fibrovascular cores
- Cuboidal cells with a finely granular cytoplasm
- Longitudinal nuclear groove
- Hyaline globules present
- Distinct fibrous capsule
- Trisomy 7
- Trisomy 17
Nonmalignant causes
anaplastic sarcoma clear cell sarcoma mesoblastic nephroma metanephric stromal tumor nephroblastomatosis / nephrogenic rests neuroblastoma oncocytoid carcinoma after neuroblastoma ossifying