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目的:研究一侧上尿路造影剂密度减低对于输尿管结石梗阻的诊断价值.材料与方法:搜集在尿路造影像上显示一侧上尿路造影剂密度减低的患者30例.所有的患者临床上都拟诊为输尿管绞痛并且经IVU和/或CT确诊为输尿管结石梗阻.男性22例,女性8例,年龄27~66岁,平均35.8岁.结果:显示一例上尿路密度减低的30例患者均伴有输尿管结石阻塞的其他尿路造影征象,包括肾盂积水30例,肾收集系统显影延迟24例,梗阻近侧输尿管扩张19例,白肾12例,输尿管截断征5例,输尿管全程显影伴轻度扩张2例,以及结石染色1例.结论:一侧上尿路造影剂密度减低是输尿管结石梗阻的功能性征象,能评价受累侧的肾功能,但它是一种非特异性征象,不能单独依靠它作出输尿管结石的诊断.“,”Objective: To evaluate the sign of diminished radiopactiy of contrast medium in unilateral upper urinary tract in the diagnosing of ureteral obstruction due to calculus. Materials and Methods: In this paper 30 patients (22 ede and 8 female, aged 27~66, mean 35. 8) with this sign were collected. All cases were suspicious of areteral colic clinically and were confirmatively diagnosed of ureteral obstruction due to CT and/or IVU. Results: Beside thes sign, all patients demonstrated the following urographis obstruction signs due to ureteral calculus as well: hydronephrosis (n = 30), delayed opacification of renal colletring systern (n = 24), dilatation of the ureter proximal to the obstruction (n = 19),white kidney (n = 12), intrruption of ureer (n = 5), full-length ureteral opacification with mild dilatation (n = 2) and calculus staining (n = 1).Conclusion: Diminshed radiopacity of contrast mednum in unilateral upper drinare tract is a functional sign in uretral obstruction due to calculus, by which the function of the involved kidney can be roughly evaluated. As this sign is non-specific, a definite diagnosis of uretral calculus cannot be made soleely by it.