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Polyarticular JIA — RACP Paediatrics MCQ

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ModerateRheumatologyPolyarticular JIARACP Paediatrics

A 9-year-old girl presents with bilateral knee pain and morning stiffness lasting over 60 minutes for the past 8 weeks. She has mild swelling of both knees and wrists. ANA is positive. RF is negative. What is the most likely subtype of JIA?

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Correct answer: A — Polyarticular RF-negative JIA

Polyarticular RF-negative JIA: ≥5 joints affected in first 6 months, negative RF. More common in girls. ANA positivity increases risk of uveitis. Regular slit-lamp examination for uveitis screening is essential.

Reference: RCH Melbourne – 2024 – Clinical Practice Guidelines: JIA