RESUMEN
Objective To evaluate the diagnostic value of MSCT longitudinal reconstruction in the ureteral obstruction.Methods 34 patients with ureteral obstruction were scaned transversely and longitudinally by GE Lightspeed 16 CT scanner and the images were reconstructed with three-dimensional software.All cases were proved by operation and pathology except for 2 cases of uretal obstruction compressed by retroperitoneal lymph nodes.Results In 34 cases,there were 22 cases of ureteral calculi,2 cases of ureteritis,3 cases of carcinoma of ureter,3 cases of pelvisureteral conjunction stricture,1 case of ureteral cyst,1 case of retrocaval ureter and 2 cases of ureter compressed by retroperitoneal metastatic lymph nodes.On longitudinal reconstruction images,22 lesions of calculi in the ureter and thickened uretal wall were showed.Contrast-enhanced CT scan was preformed in 5 cases,the CT values of lesions were increased about 20~35 HU,after administration of contrast medium,and light hydronephrosis in 18 cases,medium hydronephrosis in 6,serious hydronephrosis in 2 and no hydronephrosis in one case were showed on delayed contrast-enhanced scan.Conclusion Longitudinal reconstruction image is of significant value in diagnosis of ureteral obstruction.