A Retrospective Study About The Noncontrast Helical CT Diagnostic Evaluation Of Ureteral Microlith

Objective: The purpose of this study was to analysis and to investigate the differences of accurate rate between noncontrast helical CT and general imageology examination (eg. KUB, type-B ultrasonic) on clinical diagnosis of ureteral microlith retrospectively.Methods: We collected 38 patients with clinical final diagnosis of ureterolith. And their stones' diameter were all less than 5mm.We recorded their ages, genders, clinical manifestations, the positions of stones and their imageology manifestations on KUB , B ultrasonic and CT.Results: Among the 38 patients, 5 cases had their stones at the upper segment of the ureter, 7 cases had that at the middle segment of the ureter, and 26 cases had that at the lower segment of the ureter(68.4%). The KUB examination diagnosed 12 cases of them, about 31.6% of the total. The B-type ultrasonic found 18 cases with their stones, about 47.4% ofthe total. The noncontrast helical CT diagnosed 37 cases, about 97.4% of the total patients.Conclusion: Most of the uretral microlith were found at the lower part of the ureter. In our study the number was about 68.4%. The noncontrast helical CT was the most accurate examination for diagnosing the uretral miacrolith at present. Contrasted with other imageology methods ( eg. KUB, type_B ultrsonic), the noncontrast helical CT had more important value clinically. It could display the local focus, the relation between stones and the ureter tract. It could help to make preliminary judgment of the stone type and choose the best treatment for the patient.