Rheumatoid type of psoriatic arthritis.

Psoriatic arthritis can sometimes have a rheumatoid character, manifested especially by symmetrical involvement of the small joints of the hands. This finding was present in 23 out of a total of 150 patients with diagnosed psoriatic arthritis. The association of the rheumatoid joint syndrome and positivity of tests for rheumatoid factors in 4 patients suggest a suspected coincidental association of rheumatoid arthritis and psoriasis.