title: Mediastinal extramedullary plasmacytoma.
abstract: An asymptomatic 65-year-old woman was found to have a mediastinal mass on routine chest x-ray examination. The initial diagnosis of aneurysm of the thoracic aorta was excluded by a thoracic aortogram, and a plasmacytoma was discovered at exploratory operation.
mesh_terms: D000368:Aged; D001013:Aorta, Thoracic; D001014:Aortic Aneurysm / Q000175:diagnosis; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008479:Mediastinal Neoplasms / Q000175:diagnosis*; D010954:Plasmacytoma / Q000175:diagnosis*