CHIEN-CHANG LEEChen T.-J.Wu Y.-H.Tsai K.-C.ANG YUAN2020-12-162020-12-1620050735-6757https://scholars.lib.ntu.edu.tw/handle/123456789/526996Spontaneous retropharyngeal emphysema and pneumomediastinum presented with signs of acute upper airway obstruction [5]letter10.1016/j.ajem.2005.02.011159154272-s2.0-19544368492