目的：探讨境外输入性新型冠状病毒肺炎(COVID-19)在确诊前的胸部CT变化及演变特点。方法：采用进行回顾性分析方法，就境外输入性COVID-19患者确诊前不同时段的肺部CT影像进行对比研究。结果：33例患者，确诊前共接受78次CT检查，其中双肺受累27例，右肺受累4例，左肺受累2例。33例患者CT病灶均首发于胸膜下或肺外带。3次不同时段的CT影像，磨玻璃影(93.8%、68.7%、41.7%)、斑片状影(43.7%、68.7%、91.7%)、小叶间隔增厚(12.5%、46.8%、75.0%)、实变/亚实变(3.1%、53.1%、83.3%)，与首次CT影像，差异显著(P < 0.05)。结论：境外输入性COVID-19患者确诊前，其肺部影像有一定的演变特点。
Objective: To investigate the changes and evolution of chest CT before diagnosis of imported COVID-19. Methods: Retrospective analysis was performed to compare the lung CT images of imported COVID-19 patients at different periods before diagnosis. Results: A total of 78 CT examinations were performed in 33 patients before diagnosis, including 27 cases of bilateral lung involvement, 4 cases of right lung involvement, and 2 cases of left lung involvement. The CT lesions of 33 patients were all initially subpleural or extrapulmonary. CT images of 3 different periods showed ground glass shadows (93.8%, 68.7%, 41.7%), patchy shadows (43.7%, 68.7%, 91.7%), interlobular septal thickening (12.5%, 46.8%, 75.0%), consolidation/subconsolidation (3.1%, 53.1%, 83.3%). Compared with the first CT image, the difference was significant (P < 0.05). Conclusion: The pulmonary imaging of imported COVID-19 patients before diagnosis has some characteristics of evolution.