<prompt> Wilms tumor - most common presenting symptom-HaematuriaAsymptomatic abdominal massAbdominal painHeadache  <response>: Ans. is b i.e., Asymptomatic abdominal massWilms tumor NephroblastomaMost common malignant tumor of kidney, 80 of tumor present below 5 year of age.PresentationAsymptomatic abdominal mass M. C..Haematuria 10-25.Hypertension 25.Abdominal pain 30.Fever 20. 