输尿管下段阴性结石的诊断，通常较为困难，近十年我科收治输尿管下段阴性结石31例．现总结如下。1资料与方法1.1临床资料本组输尿管下段明性结石31例，占同期尿路结石2.4％，男22例，女9例，年龄27～54岁，平均39岁。31例均有腰部绞痛；15例伴膀脱刺激症状，1．2例伴里急后重 Lower ureteral calculi in the diagnosis of negative stones, usually more difficult, nearly 10 years, our department received 31 cases of negative ureteral stones. Now summarized as follows. 1 Materials and Methods 1.1 Clinical data The lower ureteral calculi in 31 cases, accounting for 2.4% of urinary tract stones over the same period, 22 males and 9 females, aged 27 to 54 years, mean 39 years. All of the 31 cases had lumbar colic. Fifteen patients had off-stimulating symptoms and 1.2 cases had tenesmus