title: Progressive myelopathy.
mesh_terms: D006801:Humans; D008022:Ligaments; D008297:Male; D008875:Middle Aged; D009999:Ossification, Heterotopic / Q000150:complications* / Q000000981:diagnostic imaging; D011859:Radiography; D013130:Spinal Stenosis / Q000000981:diagnostic imaging / Q000209:etiology*; D013904:Thoracic Vertebrae