Autoantibodies to a Nodal Isoform of Neurofascin in Pediatric Chronic Inflammatory Demyelinating Polyneuropathy.

Pediatric chronic inflammatory demyelinating polyradiculoneuropathy (CIDP) is an acquired immune-mediated disorder of the peripheral nervous system with a number of diagnostic pitfalls. A subset of treatment-resistant CIDP adult patients have been found with antibodies against paranodal proteins. We report the first pediatric case in a 14 year-old adolescent with a severe CIDP phenotype in whom positive anti-neurofascin 155 antibodies were found in his serum. Resistant to conventional therapies, he showed dramatic improvement when treated with Rituximab with mild to moderate functional motor disability at 24 month follow-up. In pediatric CIDP patients that remain refractory to conventional treatments, the presence of antibodies to paranodal proteins warrants investigation as it can have potential therapeutic guidance.