RÉSUMÉ
Objective To explore imaging manifestations of crossed ectopic fused kidney.Methods Data of 12 patients with crossed ectopic fused kidney were retrospectively analyzed,and the imaging manifestations of crossed ectopic fused kidney were observed.Results L type crossed ectopic fused kidney was detected in 5 cases,while inferior ectopic type(Ii type),S-shaped type and lump type(O type)ectopic fused kidney was found each in 2 cases,respectively,and doughnut or disc type(C-C type)ectopic fused kidney was noticed in 1 case.The ectopic fused kidney presented with empty one side renal cavity,while the morphology and position of the contralateral kidney were generally normal in all 12 cases,which crossed the midline and fused with the contralateral in situ kidney,including right to left crossed ectopic fusion in 8 cases and left to right crossed ectopic fusion in 4 cases.The ureters of the crossing kidney went across the midline,opened into the bladder trigone on the contralateral side in 11 cases or prostate in 1 case.Combined reproductive system abnormalities were found in 3 cases,including unicornous uterus,bicornuate uterus and cryptorchidism each in 1 case.Two cases were found complicated with abnormal inferior vena cava,including 1 case of both side inferior vena cava and 1 case of left inferior vena cava.Conclusion The imaging manifestations of crossed ectopic fused kidney had characteristics.Complete displaying of reveal fused kidney,ureteral course and opening was helpful to accurate diagnosis and classification of crossed ectopic fused kidney.