title: Letter: Continuous diaphragm sign of pneumomediastinum.
mesh_terms: D003964:Diaphragm / Q000000981:diagnostic imaging; D006801:Humans; D007362:Intensive Care Units; D008478:Mediastinal Emphysema / Q000000981:diagnostic imaging*; D011859:Radiography; D013898:Thoracic Injuries / Q000000981:diagnostic imaging