这个词是什么意思？
A chronic systemic disease, primarily of the joints, marked by inflammatory changes in the synovial membranes and articular structures, widespread fibrinoid degeneration of the collagen fibers in mesenchymal tissues, and by atrophy and rarefaction of bony structures. Etiology is unknown, but autoimmune mechanisms have been implicated.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D001172 · MeSH 2026。
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