临床资料1例：患儿，男，月。因咳嗽天，加重伴哭吼，气急1561天入院。否认异物吸入史，平时偶感冒，母孕期月曾感冒31次。体检：生长发育可，呼吸促，唇周微绀，可见吸气性三凹征。胸廓不对称，右侧塌陷，心尖搏动移向右侧，右肺叩实，左肺呈过清音，右肺呼吸音减低，左肺可闻 1 case of clinical data: children, male, month. Due to cough days, increased with cry roar, 1561 emergency admission. Denied the history of foreign body aspiration, usually with a cold, mother had a cold in the month 31 times. Physical examination: growth and development can be, breathing, lip micro-cyanosis, visible aspiration three concave sign. Thorax asymmetry, the right collapse, apical beating move to the right, right lung tapping, the left lung was voiceless, right lung breath sounds reduced, the left lung can be heard