Key clinical point: Mounting evidence strongly suggests that radiologically isolated syndrome is part of the multiple sclerosis spectrum.

Major finding: About 34% of individuals with radiologically isolated syndrome converted to multiple sclerosis within 5 years, and 51% did so by the 10-year mark.

Study details: This is an international study to date featuring 10 years of prospective follow-up of 451 patients with radiologically isolated syndrome.

Disclosures: The study is being conducted without commercial support.