subcutaneous emphysema, the presence of air or gas in the subcutaneous tissues. The air or gas may originate in the rupture of an airway or alveolus and migrate through the subpleural spaces to the mediastinum and neck. The face, neck, and chest may appear swollen. Skin tissues can be painful and may produce a crackling or popping sound as air moves under them. The patient may experience dyspnea and appear cyanotic if the air leak is severe. Treatment may require an incision to release the trapped air. Also called aerodermectasia.
