Pneumomediastinum
Abnormal presence of gas in the thorax / From Wikipedia, the free encyclopedia
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Pneumomediastinum (from Greek pneuma – "air", also known as mediastinal emphysema)[1] is pneumatosis (abnormal presence of air or other gas) in the mediastinum, the central part of the chest cavity. First described in 1819 by René Laennec,[2][3] the condition can result from physical trauma or other situations that lead to air escaping from the lungs, airways, or bowel into the chest cavity. In underwater divers it is usually the result of pulmonary barotrauma.[1]