title: A tumor of the anterior mediastinum.
mesh_terms: D000368:Aged; D001706:Biopsy; D003593:Cytoplasm / Q000648:ultrastructure; D006801:Humans; D008297:Male; D008479:Mediastinal Neoplasms / Q000473:pathology*; D008854:Microscopy, Electron; D013945:Thymoma / Q000473:pathology*; D013953:Thymus Neoplasms / Q000473:pathology