腔静脉后输尿管少见，我们遇见２例，现报告如下：例１男，３３岁，尿频伴右腰部胀痛半年余。查体发现右肾区叩痛。Ｂ超见右肾积水并输尿管上段扩张。逆行肾盂造影见右肾积水，右输尿管向中线移位，与脊柱重叠。造影剂显示第三腰椎下缘水平输尿管内呈半梗阻状，其上方输尿管明 Vena cava venous rare, we met two cases are reported as follows: Example 1 male, 33 years old, frequent urination with the right lower back pain more than six months. Physical examination found the right kidney area percussion pain. B super-see the right hydronephrosis and upper ureteral dilatation. Retrograde pyelography see the right hydronephrosis, the right ureter to the midline shift, and the spine overlap. Contrast medium showed the third lower edge of the lower edge of the ureter was semi-obstructive ureter above the Ming