title: Thymoma presenting as a middle mediastinal mass.
abstract: A case of a middle mediastinal mass which proved to be a thymoma is presented. The diagnostic difficulties that middle mediastinal masses produce and the investigations used to delineate them are discussed.
mesh_terms: D006801:Humans; D008297:Male; D008479:Mediastinal Neoplasms / Q000175:diagnosis*; D008875:Middle Aged; D013945:Thymoma / Q000175:diagnosis*