目的分析46例小儿支原体肺炎 的胸部CT，提高本病的影像学诊断水平。 方法 采用回顾资料方法，选择2011年6 月-2011年12月入住我院儿科治疗支原体 肺炎的46例患儿的CT资料进行比较分析。 结果 单侧肺叶病变者34例占73.9%(其中 右侧者20例，占58.8%，左侧者14例，占 41.2%)，双侧病变者12例占26.1%；单叶 段病变者20例占43.5%，多叶段病变者26 例，占56.5%。病变累及分布右侧肺上叶 14例、中叶6例、下叶21例；左侧肺上叶 16例、中叶6例、下叶18例。其中，肺段 实质浸润性病变(大片实变影)共32例；肺 小叶实质浸润性病变(斑点状或斑片状实 变影)30例；肺间质浸润性病变(散在斑点 或斑片状影)10例，磨玻璃影4例，多数多 叶片病变中大片实变影和斑点或斑片状实 变影共同存在。此外，其他病变还包括 肺门淋巴结肿大3例，胸腔积液11例，肺 不张2例。经系统治疗后，肺间质浸润性 病变10例治疗后7天内复查CT发现病灶全 部吸收；肺实质浸润性病变36例中，7天 内病灶吸收11例，14天内13例，21天内7 例，5例超过21天病灶吸收者均合并有其 他脏器受累情况。结论 支原体肺炎患儿 胸部CT表现有一定特点，单侧多于双侧， 右肺多于左肺，大片实变影最常见，其次 是斑点状或斑片状实变影，最少是散在斑 点或斑片状影，根据这些特点可以立于本 病早期诊断和治疗，并可以确定治疗效 果。

Objective To analyze chest CT manifestations of 46 children with mycoplasma pneumonia, and to improve the diagnostic level of mycoplasma pneumonia in children by chest CT. Methods CT data of 46 cases with mycoplasma pneumonia in our department from 2011 June to 2011 December were retrospectively compared and analyzed. Results 34 cases(73.9%) showed unilateral lung lesions, of which 20 cases showed in the right side(58.8%), 14 cases showed in the left (41.2%). 12 cases(26.1%) showed bilateral lesions. 20 cases(43.5%) showed single lobe and segment lesion; 26 cases(56.5%) showed multiple lobe and segment lesions. Lesions of 14 cases distributed in the right upper lobe, 6 cases in the middle lobe and 21 cases in inferior lobe; lesions of 16 cases distributed in the left upper lobe, 6 cases in the middle lobe and 18 cases in inferior lobe. Among them, the lung segment infiltration(large opacities) were showed in 32 cases; lobular parenchyma infiltration(punctate or patchy opacities) were showed in 30 cases; the lung stroma infiltration(scattered spots or patchy shadow) were showed in 10 cases; ground glass opacity were showed in 4 cases. Large opacities and patchy opacities were existed in multiple lobe lesions together. In addition, there were other lesions including hilar lymph node enlargement in 3 cases, pleural effusion in 11 cases and pulmonary atelectasis in 2 cases. Pulmonary interstitial infiltration were absorbed in 10 cases after 7 days' systematic treatment. Pulmonary parenchyma infiltration were absorbed in 7 days in 11 cases, 14 days in 13 cases, 21 days in 7 cases and more than 21 days in 5 cases combined with the other organ involvement. Conclusion Mycoplasma pneumonia showed certain features in chest CT images. More lesions located in unilateral lung than bilateral lungs, and more lesions located in the right lung than the left lung. Large opacities are the most common feature, then the punctate or patchy opacities. The spot or patchy shadows are uncommon. These characteristics can help the early diagnosis, treatment and evaluation of the efficacy.