title: 'Rocker-bottom thymus'. A new sign of pneumomediastinum in the neonate.
mesh_terms: D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007232:Infant, Newborn, Diseases / Q000000981:diagnostic imaging*; D008478:Mediastinal Emphysema / Q000000981:diagnostic imaging* / Q000209:etiology; D011030:Pneumothorax / Q000000981:diagnostic imaging* / Q000209:etiology; D011859:Radiography; D013950:Thymus Gland / Q000002:abnormalities* / Q000000981:diagnostic imaging