输尿管结石90%以上是在肾内形成,向下移动进入输尿管.传统的诊断方法是依据大多数泌尿系结石在X线平片上显影而行腹部平片(KUB)检查,但有10%左右的泌尿系结石对X线不显影(习惯称之为阴性结石).1997年至1999年,我们采用B超诊断输尿管阴性结石48例,为临床提供了重要的诊治参考依据,现报告如下. More than 90% of ureteral calculi are formed in the kidney and move down into the ureter.The traditional diagnostic method is based on the KUB examination of most urolithiasis on X-ray plain film, but about 10% Urinary calculi on the X-ray is not (commonly referred to as negative stones.) 1997 to 1999, we use the B-ultrasound diagnosis of ureteral negative stones in 48 cases, providing an important reference for clinical diagnosis and treatment are as follows.