Which of the following statements is NOT TRUE of multiple sclerosis?
◦ It is considered a myelin disorder.
◦ Patients may have disturbances in vision, balance, speech, or movement.
◦ Most patients are initially diagnosed with relapsing-remitting MS, but at least 50% of them will progress to the chronic progressive form.
◦ It affects 2,000–4,000 people in the United States.