title: Mediastinal mass in a young male.
mesh_terms: D000328:Adult; D002276:Carcinoid Tumor / Q000473:pathology* / Q000648:ultrastructure; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D008479:Mediastinal Neoplasms / Q000473:pathology* / Q000648:ultrastructure; D009364:Neoplasm Recurrence, Local / Q000473:pathology* / Q000648:ultrastructure; D013953:Thymus Neoplasms / Q000473:pathology* / Q000648:ultrastructure