title: Letter: Cauda equina syndrome in ankylosing spondylitis.
mesh_terms: D002420:Cauda Equina / Q000473:pathology*; D006801:Humans; D009192:Myelography; D013115:Spinal Canal / Q000473:pathology; D013167:Spondylitis, Ankylosing / Q000473:pathology*