Pediatric autoimmune encephalitis: Recognition and diagnosis

Area of Science:

• Pediatric Neurology
• Neuroimmunology
• Epidemiology

Background:

• Autoimmune encephalitis (AIE) and acute disseminated encephalomyelitis (ADEM) are inflammatory neurological disorders affecting children.
• Accurate diagnosis is crucial for timely and effective treatment, yet diagnostic challenges persist in pediatric autoimmune neurological disorders.
• Understanding the incidence and diagnostic pitfalls is essential for improving patient outcomes.

Purpose of the Study:

• To determine the incidence of AIE and ADEM in a pediatric population.
• To validate existing clinical criteria for diagnosing AIE in children.
• To identify diagnostic challenges and pitfalls in pediatric autoimmune and inflammatory neurological disorders.

Main Methods:

• Retrospective cohort study of 113 children with suspected autoimmune or inflammatory neurological disorders.
• Inclusion of three patient categories: antibody-mediated AIE, ADEM, and suspected autoimmune etiology.
• Validation of AIE diagnostic guidelines using baseline and follow-up clinical data; review of patient files and final diagnoses.

Main Results:

• The incidence of antibody-mediated AIE was 1.54/million and ADEM was 2.49/million children.
• The current AIE diagnostic guideline proved useful in the pediatric cohort.
• Diagnostic errors occurred, with 22% of initially suspected autoimmune/inflammatory cases lacking supporting evidence upon review.

Conclusions:

• Antibody-mediated AIE and ADEM are the most common autoimmune/inflammatory encephalitides in children; other forms are rare.
• Existing diagnostic criteria for AIE are applicable to pediatric cases.
• Careful data review, comprehensive workup, and consultation with specialized centers are recommended for children with nonspecific neurological symptoms suggestive of autoimmune or inflammatory conditions.