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Ankylosing spondylitis (Ankylosing spondylitis, Spondyloarthritis, Bechterew's disease, Bechterew syndrome, Marie Strümpell disease, arthritis)
Ankylosing spondylitis is a chronic, painful, degenerative inflammatory arthritis primarily affecting spine and sacroiliac joints, causing eventual fusion of the spine. It affects 750,000 Americans. (Source: Wikipedia)
