They were reliable evidences that the clear high density existed in ureter ,the contrast medium submerged calculus and the double shadow sign was neg ative.

• 结论：应用CT诊断输尿管结石优于常规方法，明确输尿管内高密度影极为关键，出现“淹没征”和“双影征”是诊断的可靠征像。