PediatricsRheumatology

juvenile idiopathic arthritis / juvenile rheumatoid arthritis

Q: What is the minimum duration of joint inflammation required to diagnose Juvenile Idiopathic Arthritis?

JIA requires chronic autoimmune joint inflammation with duration ≥6 weeks. This duration criterion helps differentiate JIA from transient reactive arthritis or other short-lived conditions.

Q: Which subtype of JIA is the most common, accounting for 50-60% of cases?

Oligoarticular JIA is the most common subtype, representing 50-60% of all JIA cases. It affects ≤4 joints, typically large joints like the knee.

Q: What is the most common extra-articular complication of JIA?

Uveitis is the most common extra-articular JIA complication. It is usually chronic anterior and often asymptomatic, requiring mandatory slit-lamp screening.

Q: Which HLA marker is associated with Enthesitis-related Arthritis (ERA)?

HLA-B27 is strongly associated with Enthesitis-related Arthritis (ERA). This subtype affects predominantly boys >8 years and may evolve to ankylosing spondylitis.

Q: What is the characteristic rash seen in Systemic JIA (Still's disease)?

Systemic JIA presents with a characteristic salmon-pink rash along with quotidian fever ≥2 weeks. This subtype is driven by IL-1/IL-6 and is considered autoinflammatory.

Juvenile idiopathic arthritis is the most common chronic rheumatic disease in children, defined as autoimmune joint inflammation occurring before age 16 years and lasting at least six weeks with no identifiable cause. Its clinical significance lies in the diverse subtypes ranging from oligoarticular to systemic forms, each carrying distinct complications such as chronic anterior uveitis in ANA-positive patients and potentially fatal macrophage activation syndrome in systemic disease. Medical students must recognize that early aggressive treatment with methotrexate and biologics significantly improves long-term outcomes, and that silent uveitis requires routine ophthalmologic screening even in asymptomatic children to prevent vision loss.

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1. What is the minimum duration of joint inflammation required to diagnose Juvenile Idiopathic Arthritis?

2. Which subtype of JIA is the most common, accounting for 50-60% of cases?

3. What is the most common extra-articular complication of JIA?

4. Which HLA marker is associated with Enthesitis-related Arthritis (ERA)?

5. What is the characteristic rash seen in Systemic JIA (Still's disease)?

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juvenile idiopathic arthritis / juvenile rheumatoid arthritis

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