Pediatric-Onset MS is defined as having an onset of MS symptoms prior to the age of 18 years. MS, which affects about 2.5 million people worldwide, is the most common cause of non-traumatic neurologic disability in young adults. It is estimated that there are about 2,000-4,000 cases of pediatric-onset MS worldwide, however, about 10% of people with MS recall in hindsight that their first symptoms starting prior to the age of 18 years.

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