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Fig. 5D —50-year-old man with syphilitic aortitis and bilateral renal artery stenosis (RAS). Postoperative CTA image obtained after aortoaortic bypass with reimplantation of right renal artery shows urine CT attenuation values of right (01) and left (02) proximal ureters are 670.2 H and 1,378.7 H, respectively. Difference of urine CT attenuation values between both sides was reversed when compared with that of preoperative CTA; ratio is 2.06.