Pneumomediastinum physical examination

Pneumomediastinum Microchapters
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Physical Examination

Pneumomediastinum is uncommon, it occurs when air leaks from any part of the lung or airways into the mediastinum and is often recognized on auscultation by a "crunching" sound timed with the cardiac cycle (Hamman's crunch). Subcutaneous emphysema is one of the symptoms of pneumomediastinum.