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目的：评价轮缘征对输尿管结石在ＣＴ诊断和鉴别诊断中的价值。材料与方法：腹部平片无异常，在静脉尿路造影像上怀疑输尿管阴性结石患者５１例，随后进行ＣＴ平扫来验证输尿管阴性结石的存在与否以及轮缘征的显示率。结果：除２例因结石染色明确诊断外，４９例ＣＴ扫描显示结石者４３例，检出率为８７．７％。其中输尿管结石伴轮缘征者２９例，占６７．４％，结石平均直径为３．７ｍｍ，ＣＴ值１００～４２２ＨＵ。轮缘征最大直径１３．０ｍｍ，平均６．４ｍｍ，ＣＴ值为１４～２２ＨＵ。未出现轮缘征者１４例，结石平均直径为５．８ｍｍ。结论：轮缘征是诊断输尿管结石较可靠的ＣＴ征象，具有较高的诊断价值，此征还可与静脉石和其他性质的钙化具有鉴别意义。
Objective: To evaluate the value of rim sign on the diagnosis and differential diagnosis of ureteral calculi. MATERIALS AND METHODS: Totally 51 cases of ureter negative stones were suspected to be involved in the imaging of venous urography, followed by CT scan to verify the presence or absence of ureteral negative stones and the rate of rim formation. Results: In addition to the two cases of clear diagnosis of stone staining, 49 cases of CT scan showed stones in 43 cases, the detection rate was 87.7%. Among them, 29 cases of ureteral calculi accompanied by wheel rim, accounting for 67.4%, average diameter of stone was 3.7mm, CT value was 100-422HU. The maximum rim diameter of 13.0mm, an average of 6.4mm, CT value of 14 ~ 22HU. There were 14 cases without rim marks, the average diameter of stones was 5.8mm. CONCLUSION: The rim sign is a reliable CT sign in the diagnosis of ureteral calculi, which has a high diagnostic value. The sign may be of differential significance with calculi of venous stone and other features.