<prompt> Abdominal ultra-sonography in a 3 year old boy show a solid circumscribed hypoechnoic renal mass. Most likely diagnosis is -Wilms tumorRenal cell carcinomaMesoblastic nephromaOncocytoma  <response>: Amongst the given options only Wilms tumor is common at 3 years of age :- Wilms tumor young children mean 3 yearsMesoblastic nephroma 1 yearRenal cell carcinoma 40 yearsOncocytoma 25-95 years mean 65 