Objective:To enhance the recognition of pyeloureteric junction(PUJ)obstruction and improve the diagnosis of its cause.Methods:Thirty-eight patients with pyeloureteric junction obstruction underwent intravenous urography(IVU)

retrograde urography(RGU) and CT examinations.X-ray and CT findings in all patients were analyzed retrospectively.Results:On X-ray and CT images in all patients the morphologic features and hydronephrosis state of pyeloureteric junction obstruction were clearly visualized.Conclusion:Urography combined with CT examination can judge obstructive position and renal function

and it is a most efficient diagnostic method for obstructive disease in PUJ.