title: Asymptomatic mediastinal mass situated posterolateral to the trachea.
mesh_terms: D000236:Adenoma / Q000175:diagnosis*; D001466:Barium Sulfate; D003937:Diagnosis, Differential; D006045:Goiter, Substernal / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008479:Mediastinal Neoplasms / Q000175:diagnosis*; D008875:Middle Aged; D013902:Radiography, Thoracic; D014054:Tomography
chemical_list: D001466:Barium Sulfate