目的　探讨SARS胸部影像学特征。方法　回顾性分析 2 0 0 4年首批确诊的 3例散发SARS病例胸部影像学表现。结果　 3例SARS病例影像学表现均为磨玻璃状密度病变与肺实变影像并存 ,双肺多叶多段受累 ,病灶出现早进展迅速。结论　 2 0 0 4年首批SARS确诊病例的影像学表现及动态变化 ,符合 2 0 0 3年SARS胸部影像学表现特征。 Objective To investigate the features of SARS chest imaging. Methods A retrospective analysis was performed on thoracic imaging findings of the first batch of 3 SARS cases diagnosed in 2004. Results The imaging findings of three cases of SARS were both glasglass-like density lesion and pulmonary consolidation. The multi-lobe of lung were involved in multiple stages, and the early progression of the lesion appeared rapidly. Conclusion The imaging findings and dynamic changes of the first confirmed cases of SARS in 2004 are in line with SARS thoracic imaging findings in 2003.