Question

originates from all three germ cell layers, most occur in the area of the upper pole of the left kidney, 90% are benign, complex with echogenic and cystic areas, 50% occur in children

Answer 1

The description you provided is indicative of a Wilms tumor. Wilms tumor is a kidney cancer that primarily affects children and typically originates from all three germ cell layers. It often presents as a complex mass in the upper pole of the left kidney, and the majority of cases (about 90%) are benign.