Joint Involvement in Sarcoidosis with Special Reference to the Coexistence of Sarcoidosis and Rheumatoid Arthritis

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Abstract
Summary In a group of 94 cases of sarcoidosis one definite and one probable case of rheumatoid arthritis was found. Additionally, the x-ray findings in some of the patients were similar to those in rheumatoid arthritis. Signs of rheumatoid arthritis were no more frequent than would be expected in a group of subjects of equal size without sarcoidosis. The most common form of joint involvement in sarcoidosis was migratory polyarthritis, which in cases of subacute sarcoidosis had an incidence of 33 per cent, and in association with erythema nodosum 57 per cent. Difficulties of differential diagnosis will arise mostly with respect to rheumatic fever, especially when the disease begins with joint symptoms and fever. In such atypical cases of arthritis the Kveim test is of diagnostic value.

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