患者,男,38岁.间歇性腰痛4月余入院.B超诊断为右肾积水.静脉尿路造影检查示右肾盂积水,右输尿管上段扩张,于L_4水平输尿管迂曲,中、下段输尿管显影浅淡.增强CT扫描示右输尿管在L_4水平位于下腔静脉后方,在L_5水平又绕到下腔静脉前方,矢状面重建图像显示更清晰,诊断为环腔静脉输尿管.手术将输尿管游离至下腔静脉前方,行 Patients, male, age 38. Intermittent lumbago more than 4 months admitted to the hospital.B ultrasound diagnosis of right hydronephrosis.Verectal urinary tract angiography showed right hydronephrosis, the upper right ureteral dilatation, ureteral tortuous L_4 level, the lower ureteral imaging Tight enhancement CT scan showed the right ureter in L_4 level behind the inferior vena cava in L_5 level and around to the inferior vena cava in front of the sagittal reconstruction image shows more clearly diagnosed as annular venous urethra surgery free ureter to the next Caval vein anterior, line