Medical Dictionary

pneumomediastinum

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noun pneu·mo·me·di·as·ti·num \ ˌn(y)ü-mō-ˌmēd-ē-ə-ˈstī-nəm \

medical Definition of pneumomediastinum

plural pneumomediastina play \-nə\
1 :an abnormal state characterized by the presence of gas (as air) in the mediastinum
2 :the induction of pneumomediastinum as an aid to radiography

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