| http://www.w3.org/ns/prov#value | - The major-ity of patients in groups B and C will develop radio-graphic sacroiliitis and possibly syndesmophytes withtime, and only a small proportion of patients in group Dmay never develop radiographic sacroiliitis despite hav-ing IBP for many years.In a patient with early AS at the preradiographicstage, making the diagnosis is particularly challengingfor the following 3 reasons.
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