A 7-year-old girl presents with a 6-week history of arthritis in both knees and her right ankle. She also reports dry eyes and dry mouth. ANA is positive at 1:320 (speckled pattern). Anti-SSA (Ro) and anti-SSB (La) antibodies are positive. Schirmer's test is positive. Which of the following correctly describes the classification of this case under JIA (Juvenile Idiopathic Arthritis)?
- A She would be classified as oligoarticular JIA with ANA-positive subtype
- B The dry eyes, dry mouth, and Ro/La antibodies indicate juvenile Sjögren's syndrome co-existing with or mimicking JIA ✓
- C Polyarticular RF-negative JIA with secondary sicca features
- D Systemic JIA with serositis
Explanation
The combination of arthritis, keratoconjunctivitis sicca (dry eyes on Schirmer's test), xerostomia (dry mouth), positive ANA, and positive anti-SSA/Ro and anti-SSB/La antibodies is characteristic of juvenile Sjögren's syndrome (jSS), not classic JIA. While both JIA and jSS can present with arthritis in children, the presence of sicca features and Ro/La antibodies identifies jSS as the primary or co-existing diagnosis. Oligoarticular JIA (fewer than 5 joints in first 6 months) can be ANA-positive but does not typically have Ro/La antibodies or sicca features. The correct classification here is juvenile Sjögren's syndrome presenting with arthritis.
Reference: Ghai Essential Pediatrics, 10th ed.
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Written and medically reviewed by the StethoPrep medical team.