Ankylosing spondylitis (AS, from Greek ankylos, bent; spondylos, vertebrae), previously known as Bekhterev's disease, Bekhterev syndrome, and Marie-Strümpell disease, a form of Spondyloarthritis, is a chronic, inflammatory arthritis and autoimmune disease. It mainly affects joints in the spine and the sacroilium in the pelvis, and can cause eventual fusion of the spine.Read more on Wikipedia
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