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Definition of Pneumomediastinum

Pneumomediastinum: Free air in the space between the lungs (mediastinum), which may give rise to pneumothorax or pneumopericardium and compromise the lungs or heart.

Source: MedTerms™ Medical Dictionary
http://www.medterms.com/script/main/art.asp?articlekey=4960
Last Editorial Review: 3/19/2012

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