title: The aberrantly positioned thymus: a cause of mediastinal or neck masses in children.
mesh_terms: D003937:Diagnosis, Differential; D004947:Esophagus / Q000000981:diagnostic imaging; D005260:Female; D006258:Head and Neck Neoplasms / Q000000981:diagnostic imaging*; D006801:Humans; D007223:Infant; D008297:Male; D008479:Mediastinal Neoplasms / Q000000981:diagnostic imaging*; D011859:Radiography; D013950:Thymus Gland / Q000002:abnormalities* / Q000196:embryology; D014132:Trachea / Q000000981:diagnostic imaging