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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 study the diagnostic value of reducing the contrast density of upper urinary tract on the obstruction of ureteral calculi. MATERIALS AND METHODS: Thirty patients with de novo contrast density on the one side of the urinary tract were collected. All patients were clinically clinically diagnosed with ureteral colic and diagnosed with ureteral stone obstruction by IVU and / or CT. 22 males and 8 females, aged 27 to 66 years old, with an average of 35.8 years old. Results: One case of lower urinary tract densitometry was associated with other signs of urography, including hydronephrosis in 30 cases, delayed renal development in 24 cases, proximal ureteral obstruction in 19 cases, white 12 cases of renal, ureteral truncation in 5 cases, full ureteral development with mild expansion in 2 cases, and stone staining in 1 case. CONCLUSIONS: Lowering the density of the upper urinary tract contrast agent is a functional sign of ureteral calculi obstruction and can assess renal function in the affected side, but it is a non-specific sign that can not be used alone to diagnose ureteral calculi.