目的　探讨急性输尿管结石时肾周水肿的CT平扫表现、产生机理及意义。方法　对 73例确诊为急性输尿管结石病人的CT片进行回顾性分析。结果　 8例无明显肾周水肿 ,41例局限性肾周水肿 ,2 4例广泛性肾周水肿。结论　肾周水肿是急性输尿管结石梗阻的重要CT征象。 Objective To investigate CT manifestations of perirenal edema in acute ureteral calculi, its mechanism and significance. Methods 73 cases of acute ureteral calculi confirmed by CT were retrospectively analyzed. Results Eight cases had no obvious peritoneal edema, 41 cases had limited peritoneal edema and 24 cases had extensive peritumoral edema. Conclusion Perirenal edema is an important CT sign of acute ureteral obstruction.