title: Long-standing ankylosing spondylitis with back pain.
authors.affiliation: Harvard Medical School, Boston, Massachusetts.
authors.forename: L
authors.initials: L
authors.lastname: Laurent-Haupt
authors.forename: K D
authors.initials: KD
authors.lastname: Westmark
mesh_terms: D006801:Humans; D010146:Pain / Q000209:etiology*; D011877:Radionuclide Imaging; D013167:Spondylitis, Ankylosing / Q000150:complications / Q000175:diagnosis* / Q000000981:diagnostic imaging; D014057:Tomography, X-Ray Computed