Pneumomediastinum

Focused Exam

• Hamman's Crunch
  On auscultation you will hear a crunching sound with cardiac contraction due to compression of air in the mediastinum.
• Subcutaneous Emphysema
  Air often escapes along facial planes and tracks to neck and chest wall. On palpation one can feel the crepitations. Extraneous crackling sound will also be heard during auscultation.