38.3 Primary Immunodeficiencies: When is it not just "JIA"

Area of Science:

• Pediatric Rheumatology
• Immunology
• Clinical Medicine

Background:

• Juvenile Idiopathic Arthritis (JIA) is a diagnosis of exclusion with no definitive diagnostic test.
• JIA presents with classical clinical features and is categorized by phenotype.
• Diseases mimicking JIA, such as Primary Immunodeficiencies (PID), can lead to misdiagnosis.

Purpose of the Study:

• To review the basics of Primary Immunodeficiencies (PID).
• To discuss PIDs that present with arthritis and can be confused with JIA.
• To improve diagnostic accuracy for JIA and related conditions.

Main Methods:

• Literature review of PIDs and their association with arthritis.
• Analysis of clinical features that differentiate JIA from PID.
• Discussion of diagnostic clues for suspecting PID in cases of apparent JIA.

Main Results:

• PIDs can present with arthritis, mimicking JIA.
• Key indicators for suspecting PID include early onset, family history, recurrent infections, and unusual symptoms like urticaria or interstitial lung disease.
• Poor response to conventional JIA therapy may suggest an underlying PID.

Conclusions:

• Accurate differentiation between JIA and PID is crucial for appropriate patient management.
• Clinicians should consider PID in the differential diagnosis of JIA, especially when atypical features are present.
• Awareness of PID presentations can prevent delayed diagnosis and treatment.