“…1,5 Abnormalities involve the ectopic kidney and consist of UPJ obstruction (29%), vesicoureteral reflux (15%), megaureter, hypospadias, cryptorchidism, urethral valves, cystic dysplasia, or carcinoma. 2,5,7 This case represents a right-to-left crossed fused renal ectopia with a ureteropelvic junction obstruction of the orthotopic kidney, which is rarely reported in literature. 4,10 UPJ obstruction with other congenital anomalies of the upper urinary tract can be diagnostically and therapeutically challenging.…”