<prompt> Most common tumor of kidney in children is:Wilms tumorNeuroblastomaPolycystic kidney diseaseRenal cell carcinoma  <response>: a. Wilms tumorRef: Nelsons 20e p 2464-2465Wilms tumor WT, also known as nephroblastoma, is the most common primary malignant renal tumor of childhood;It is the second most common malignant abdominal tumor in childhood.The most common sites of metastases from Wilms tumor are the lungs, regional lymph nodes, and liver. 