<prompt> Which of the following is true regarding Wilms tumor?Commonest presenting feature is lump abdomenInvariably unilateralExtremely poor prognosis in infantsAll the above  <response>: The triad of Wilms tumor is abdominal mass, pyrexia and hematuria. 5 of the cases have bilateral mass. Wilms tumor or nephroblastoma, is the most common childhood abdominal malignancy. At present, survival rates of children with Wilms tumor are approximately 80-90. Examples of common congenital anomalies associated with Wilms tumor are cryptorchidism, a double collecting system, horseshoe kidney and hypospadias. 