Subcutaneous emphysema is the local tissue swelling caused by the gas entering the subcutaneous tissue through the tissue gap. Although subcutaneous emphysema is usually a nonfatal and self-limited disease, in severe cases, the gas may spread to the neck, mediastinum and chest, resulting in mediastinal emphysema and other serious complications. This article reviews the etiology, pathogenesis, clinical manifestations, diagnosis, differential diagnosis of subcutaneous emphysema related to dental therapy,and operations that may cause subcutaneous emphysema in stomatology department,as well as the treatment and prognosis of subcutaneous emphysema, with a view to providing some references for dentists.
Humans ; Diagnosis, Differential ; Mediastinal Emphysema/pathology* ; Subcutaneous Emphysema/therapy* ; Neck/pathology* ; Face

Pneumomediastinum and subcutaneous emphysema generally occurs following trauma to the esophagus or lung. It also occurs spontaneously in such situations of elevating intra- thoracic pressure as asthma, excessive coughing or forceful straining. We report here on the rare case of a man who experienced the signs of pneumomediastinum and subcutaneous emphysema after a prolonged bout of intractable hiccup as the initial presenting symptoms of multiple sclerosis.
Adult ; Brain/pathology ; Hiccup/*complications/etiology ; Humans ; Magnetic Resonance Imaging ; Male ; Mediastinal Emphysema/*etiology/radiography ; Multiple Sclerosis/*complications/diagnosis ; Subcutaneous Emphysema/etiology ; Thoracic Vertebrae/pathology ; Tomography, X-Ray Computed