Massive subcutaneous emphysema after off-pump coronary bypass surgery.

Subcutaneous emphysema is a condition when air gets accumulated into the tissues under the skin and in the soft tissues of the chest wall or neck but can also spread to other parts of the body. It generally causes minimal symptoms and nonlethal; sometimes, it may be severe and life-threatening if deeper tissues of the thoracic outlet and chest are involved. It is essential to know the mechanisms of subcutaneous emphysema after cardiac surgery.