A 39-Year-Old Woman with Cervicofacial and Mediastinal Emphysema 10 Hours After an Elective Lower Molar Dental Extraction.

BACKGROUND Mediastinal emphysema, also called pneumomediastinum, is a very infrequent condition in patients reporting to an Emergency Department. Mediastinal emphysema is the pathologic presence of free air enclosing the mediastinal structures. In the case of chest pain in a young healthy adult, pneumomediastinum as a differential diagnosis will undoubtedly be omitted.