Ankylosing spondylitis (AS) is a chronic, inflammatory disease of the axial skeleton, with variable involvement of nonarticular structures and peripheral joints.
<p>A&nbsp;37-year-old man presents to the emergency department (ED) with a headache that developed approximately 3 days earlier. The throbbing headache has worsened over the past few days...
Twenty-four hours after a car accident, a 47-year-old man with chronic low back pain-which had been diagnosed years earlier as "arthritis" of the spine-presented with back and...
