CAPOS and Beyond: ATP1A3 Variants in Pediatric Movement Disorders – Case Reports

These cases underscore the importance of considering <i>ATP1A3</i> variants in children presenting with GBS-like features, infection-triggered neurological attacks, and mixed movement disorders. Our findings highlight the diagnostic value of genetic testing in atypical neuroregression syndromes and contribute to the recognition of "blended" <i>ATP1A3</i> phenotypes beyond classical diagnostic entities. The novel pathogenic variant further supports ongoing efforts to refine genotype-phenotype correlations within this evolving group of neurological disorders.