Rheumatoid arthritis
Rheumatoid arthritis (RA) is a multisystem, inflammatory, autoimmune disorder; the exact etiology is unknown. RA is a disease primarily of the joints and is clinically known as an 'arthritis' although extra-articular manifestations occur. Extra-articular features include nodules, carditis and pericarditis, vasculitis, lung disorders, and other manifestations.
69896004 |Rheumatoid arthritis (disorder)| remains a primitive concept in SNOMED CT and must be stated as a parent (IS A relationship) for all rheumatoid arthritis concepts.
For example,
201776007 |Rheumatoid arthritis of sacroiliac joint (disorder)|


Example of extra-articular rheumatoid manifestation,
28880005 |Rheumatoid arthritis with carditis (disorder)|


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