In some children, systemic symptoms may precede the onset of polyarthritis for up to several months. Other possible characteristics of this form of arthritis include pericarditis, pleuritis, anemia, leukocytosis, thrombocytosis, and lymphoadenomegaly usually located in the laterocervical, axillary, and inguinal lymph nodes accompanied by splenomegaly.
In the form of systemic onset, iridocyclitis is very rare, joint affectation is initially limited to diffuse arthralgias; the disease can evolve with an important polyarticular involvement Flekosteel, always associated with systemic symptoms, or failing to evolve in a true polyarticular form without any systemic symptoms.
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