D2I2.
acute

Pneumomediastinum

Pneumomediastinum is in the mediastinum, the central part of the chest . First described in 1819 by René Laennec, the condition can result from physical or other situations that lead to air escaping from the lungs, , or bowel into the chest cavity. In underwater divers it is usually the result of barotrauma.

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Plain-language summary adapted from Wikipedia. Not medical advice.