Crossed renal ectopia.

A 2 year old male child presented with mass on right side of abdomen. The clinical diagnosis of renal lump was made and rest of the examination did not reveal any abnormality. His intravenous pyelography showed non-functioning left kidney. Cystoscopy and ascending pyelography on left side showed normal ureteric orifices and crossing of the left ureter to opposite side. Ectopic kidney was removed without any damage to the lower pole of the right kidney.