Commonest tumour of lumbar region in children is ?

Ans is 'b' ie Neuroblastoma "Neuroblastoma is the most common solid tumor of childhood outside the CNS. It is the most frequently diagnosed neoplasm in infant. The median age at diagnosis is 2 yrs. 90% of cases are diagnosed before the age of 5 yrs. NB may develop at any site of sympathetic nervous system, most NB arises in the abdomen, either in the adrenal glands or in retroperitoneal sympathetic ganglia. Abdominal NB commonly presents as a hard, fixed abdominal mass that is producing discomfo." - Nelson Neuroblastoma is the III MC tumor of children Both Neuroblastoma & wilm's may present as lumbar masses. Although we could not find which one of these would be the MC tumor of lumbar region. we would definitely vote for Neuroblastoma.