Abstract
A 68-year-old man with an abdominal aortic aneurysm and horseshoe kidney is reported. Preoperative multi slice computed tomography(MSCT) revealed an accessory renal arteries arising from the aortic bifurcation to the isthmus of the kidney. The urinary tract and the aorta were detectable by CT at the same time. We operated taking a medial transperitoneal approach. The aneurysm was successfully replaced by a knitted Dacron bifurcated graft without resection of the renal isthmus. The accessory artery flowed back from the left common iliac artery bypass. The patient was discharged on the 25th day after the operation. Postoperative CT scan showed no sign of renal infarction and confirmed the patency of the reconstructed accessory renal artery. MSCT was useful to reveal aberrant renal arteries and urinary tract of the horseshoe kidney.