RESUMO
Objective To analyze the reasons and imaging features of acute urinary tract obstruction and perinephritis and to evaluate the diagnostic efficacy of CT and MR in this kind of patients.Methods Imaging features of 72 patients with acute urinary tract obstruction were analyzed.The advantages of CT and MR were evaluated in diagnosis of the diseases.Results In all 70 patients (72 sites)with ureteral calculus,the accurate rates of diagnosis were 100% on CT and 59.7% on MR.In the 72 patients with perinephritis,the detection rate of effusion in perinephric soft tissue on MR was better than that on CT.Conclusion CT or MR has individually diagnostic advantage in acute urinary tract obstruction and perinephritis,CT is better in ureteral calculus and MR in perinephritis.