Abstract
Objective To evaluate the diagnostic effect of CT urography (CTU) in patients with non-calculous obstructive diseases of urinary tract.Methods Forty cases with non-calculous urinary obstruction underwent helical CT during nephrographic and excretory phases.Three dimensional CTU was obtained with the reconstruction of excretory phase axial images through the workstation.Results 24 of 40 cases with benign obstruction had a slight or severe urinary dilation.Among them,18 congenital urinary malformations showed specific findings.Four ureteric inflammations revealed a gradual taper of the lumen just like a beak,and another two prostatic hypertrophy appeared oval impression upon the middle of the posterior bladder.Six intrinsic and 10 extrinsic tumors were seen irregular filling defects of the urinary tracts as well as soft tissue mass surrounding the obstructive site,accompanied by the middle urinary dilation in 12 cases and severe in four.Meanwhile,bilateral ureterohydronephroses were also found in four extrinsic tumors.In six patients with unilateral nonfunctioning urinary tracts,CTU could be imaged with minimum intensity projection (MinIP) and then be merged with contralateral maximum intensity projection (MaxIP).Conclusion CTU is an effective modality in the evaluation of non-calculous urinary obstruction diseases.
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