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Rheumatoid arthritis and hereditary angioedema.

We describe a case in which rheumatoid arthritis (RA) developed in a patient with hereditary angioedema. Hereditary angioedema, one of the inherited complement deficiencies, has been reported in association with a number of autoimmune disorders, but there has been only 1 report of an association between RA and hereditary angioedema.