Two Cases of the psoriatic arthritis were reported.
Case 1: A 33-year-old woman was typical psoriatic arthritis, in which deterioration and improvement of psoriasis synchronized with those of arthritis. In roentgenogram, joints of finger and toe were highly destructed, and partially revealed pencil-in-cup deformity. In laboratory data, RA factors were negative in course of all duration.
Case 2: A 57-year-old man was atypical psoriatic arthritis which was seropositive, and did not synchronized with skin lesion. Moreover, the clinical features of psoriatic arthritis and differencial diagnosis of psoriatic arthritis, were discussed.