Pedunculated and obstructive Wilms\u27 tumor: A rare presentation in a 2 year- T old male

Wilms\u27 tumor manifesting as an obstructing ureteral mass is extremely rare. Herein, we report an unusual case in which a child presented with a clinical picture concerning for and suggestive of ureteropelvic junction ob- struction (UPJO), but was instead found to have an intrapelvic pedunculated Wilms\u27 tumor with extension into the proximal ureter. We discuss the patient\u27s diagnostic workup, radiographic, operative and pathologic findings, as well as important lessons learned from this unusual case