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pneumomediastinum

[ nōō′mō-mē′dē-ə-stīnəm ]
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n.

The escape of air into the mediastinal tissues, usually from interstitial emphysema or from a ruptured pulmonary bleb.

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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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