Which of the following is the most common extra-articular manifestation of ankylosing spondylitis?
ExplanationAlthough the most serious spine complication of ankylosing spondylitis is a fracture, there are a number of important extra-articular manifestations. Anterior uveitis is the most common, occurring in 40% of patients with ankylosing spondylitis. Infammatory bowel disease has been reported to be frequently present. Less common complications include aortic insufciency, third-degree heart block, pulmonary nodules and upper lobe fbrosis, cardiac dysfunction, retroperitoneal fbrosis, prostatitis, and amyloidosis.
