目的　研究传染性非典型肺炎的影像学表现和特征。方法　收集 80例经临床证实的传染性非典型肺炎患者的影像学资料 ,分析其特征。结果　肺部异常表现平均出现在发热后 2 .3d ,多为片状密度增高影 ,可出现在肺内任何部位 ,多发病变占一定比例 (4 3 .8% ) ,病变变化快。CT在早期诊断和预后观察中有一定意义。结论　影像学在传染性非典型肺炎的诊断和治疗效果判定中有重要作用。 Objective To study the imaging features and manifestations of SARS. Methods The imaging data of 80 clinically confirmed cases of SARS were collected and their characteristics were analyzed. Results The abnormal lung manifestations occurred on average 2.3 days after fever, mostly due to the increase of lamellar density, which could occur in any part of the lung. The multiple lesions accounted for a certain proportion (43.8%) and the lesions changed rapidly. CT in the early diagnosis and prognosis of a certain significance. Conclusion Imaging plays an important role in the diagnosis and treatment of SARS.