Medical Definition of pneumomediastinum
plural pneu·mo·me·di·as·ti·na \-nə\play
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
Seen and Heard
What made you want to look up pneumomediastinum? Please tell us where you read or heard it (including the quote, if possible).