Assessment of the Frequency of Functional Neurological Disorders in Multiple Sclerosis and Analysis of Clinical and Psychological Determinants

Multiple sclerosis (MS) and functional neurological disorders (FND) share clinical features, which may result in FND being overlooked in patients with MS. They also share common comorbidities, including depression and alexithymia. As their management differs, assessing the frequency and determinants of FND in patients with MS is important to improve diagnosis and ensure appropriate management.

Inclusion Criteria: * Adult patient (≥ 18 years of age) * Diagnosis of multiple sclerosis (MS) according to the 2024 McDonald criteria * Stable brain MRI performed within the previous 12 months * No relapse between the MRI and study enrollment * Ability to understand French * Affiliated with the French national health insurance system * Willing to participate in the study Exclusion Criteria: * Patient unwilling to participate in the study * Known severe psychotic disorder * Patient under judicial protection (sauvegarde de justice) * Patient under guardianship or curatorship (tutelle or curatelle)