Posterior mediastinal mass.
D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D008479:Mediastinal Neoplasms / Q000175:diagnosis; D008588:Meningocele / Q000175:diagnosis*; D008875:Middle Aged; D009456:Neurofibromatosis 1 / Q000175:diagnosis; D013904:Thoracic Vertebrae / Q000002:abnormalities*