Which of the following facts about multiple sclerosis is not true?

d. Multiple sclerosis is one of the most common of a group of inflammatory conditions affecting the CNS. It leads to a relapsing and remitting course for the disease but ultimately most patients develop progressive permanent neurological symptoms. It is a fairly common disease and normally presents in young patients. Its effects are wide reaching, in addition to the physical disability that develops, psychological problems often accompany the physical symptoms. At present there is no proven treatment, - interferon has been shown to reduce the relapse rate of exacerbations but not alter the disease progression. Patients are plagued with a combination of eye problems, motor weakness, sensory loss, cerebellar and brainstem lesions in addition to spinal cord damage. Its investigation remains challenging due to the intermittent course that the disease initially undertakes.