病例女，１岁８个月。咳嗽气喘发热３天，发现颈部及胸壁隆起且发展迅速就诊。体检：颈面部软组织隆起，扪诊有握雪感，听诊左肺呼吸音低，可闻及湿罗音。临床诊断：肺炎，颈面部皮下气肿。X线检查所见：胸片示双肺纹理粗乱模糊，左肺下野见斑片状影且伴有透光度增高（较对侧） Case female, 1 year and 8 months. Cough Asthma fever 3 days, found the neck and chest wall uplift and rapid development of treatment. Physical examination: cervical facial soft tissue uplift, palpitation has a sense of snow, auscultation left lung breath sounds low, can be heard and wet rales. Clinical diagnosis: pneumonia, cervical subcutaneous emphysema. X-ray examination showed: chest film showed double lung texture rough disorder, see the left lung field patchy shadow and accompanied by increased transmittance (compared to the opposite side)