Rheumatoid arthritis (RA)
Rheumatoid arthritis (RA) is a common, chronic polyarthritis which may be classified as a diffuse, multi-system, connective tissue disease. The hallmarks of RA are positive testing for immunoglobulin M (IgM) rheumatoid factor; bilateral, usually symmetrical joint disease; erosive changes noted radiographically; and persistent inflammatory synovitis.…