Solitary crossed renal ectopia and its associated congenital anomalies.

Solitary crossed renal ectopia is one of the rarest congenital renal anomalies, with only 21 previously reported cases. It is often accompanied by multisystem congenital anomalies, mainly skeletal and genital in type. The twenty-second such case of this rare congenital anomaly is reported in association with a severe congenital scoliosis of the lumbosacral spine. The embryogenesis and the significance of its associated congenital anomalies are discussed.