Psoriatic arthritis in childhood.

Since both psoriasis and seronegative arthritis occur individually in childhood, they may be expected to occur together occasionally. Clinical features used to identify psoriatic arthritis as a disease sui generi have been assembled in groups of adult patients, establishing the justification for describing a distinct syndrome. A review of the experience in an active children's rheumatology service indicates that the syndrome of psoratic arthritis occurs in the pediatric-aged patient with sufficient frequency to qualify as a diagnostic term appropriate in the classification of childhood-onset arthritis.