title: Normal mediastinal mass in late childhood.
mesh_terms: D000293:Adolescent; D000792:Angiography; D002648:Child; D003937:Diagnosis, Differential; D005260:Female; D005471:Fluoroscopy; D006801:Humans; D008479:Mediastinal Neoplasms / Q000000981:diagnostic imaging; D008482:Mediastinum / Q000000981:diagnostic imaging*; D013950:Thymus Gland / Q000033:anatomy & histology / Q000000981:diagnostic imaging* / Q000254:growth & development / Q000601:surgery; D013952:Thymus Hyperplasia / Q000000981:diagnostic imaging; D013953:Thymus Neoplasms / Q000000981:diagnostic imaging; D013959:Thyroid Diseases / Q000000981:diagnostic imaging