Iatrogenic subcutaneous cervicofacial and mediastinal emphysema.

Subcutaneous emphysema of the head, neck and mediastinum occurs with a variety of disease processes. Most cases involve the passive escape of air from the aerodigestive tract into subcutaneous tissues. The many causes include head and neck surgical procedures, tracheal and esophageal trauma, intraoral trauma, foreign bodies and neoplasms of the aerodigestive tract, and pulmonary barotrauma from mechanical ventilation or in patients with pulmonary disorders. Subcutaneous emphysema secondary to active injection of air has recently been reported following certain dental procedures. An interesting case of diffuse cervicofacial and mediastinal emphysema following a difficult extraction of an infected lower molar tooth with a high-pressure air drill is presented. The patient required airway observation and high-dose antibiotic therapy. Early recognition of this unique problem is essential in preventing such life-threatening complications as airway obstruction, mediastinitis, deep neck infection, and cardiac failure. Diagnostic and therapeutic recommendations are included.