Subcutaneous emphysema induced by supplementary oxygen delivery nasopharyngeal cannula. Case report.

Background And Objectives: The development of subcutaneous emphysema involving face, neck, and thorax has been well-documented in cases of odontologic procedures, head and/or neck surgery, and craniofacial trauma. Its development without known damage to the mucosa is rare. This report describes the case of a patient who developed emphysema without an obvious lesion.