Conclusion: Rccognizing the X-ray signs on IVU and combining with plain CT scan findings is very essential for the diagnosing of radiolucent ureteral calculus.

• 结论：熟悉和掌握IVU的X线征象结合CT平扫是诊断输尿管阴性结石的一种准确、无创的有价值的检查方法。