It is the commonest neonatal renal tumour. Diagnosis is usually made in the antenatal period or immediately after birth. The tumour accounts for ~3-6% of all renal neoplams in children 3,7. Approximately 50% occur during the neonatal period and most of the cases are diagnosed within the first 3 months of life 11. Overall, 90% of the cases are discovered by the age of 1 year 11.