Pneumomediastinum.
D000293:Adolescent; D000328:Adult; D002648:Child; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008297:Male; D008478:Mediastinal Emphysema / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000209:etiology; D010493:Pericarditis / Q000175:diagnosis; D011859:Radiography