Juvenile idiopathic arthritis Juvenile idiopathic arthritis is broad term that describes a clinically heterogenous group of arthritides of unknown cause, which begin before 16 years of age. This term encompasses several disease categories : - 1. Juvenile rheumatoid arthritis (see previous explanations) : - i) Pauciarticular (oligoarticular) JRA ii) Poly-articular JRA RA. factor (+) ye RA factor (-) ye iii) Systemic JRA Juvenile psoriatic arthritis Juvenile enthesitis related arthritis (ERA) Subgroups of Juvenile Idiopathic Arthritis (JIM
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