Multiple Sclerosis- Tysabri maintenance- follow up progression. There is no significant interval change in the multiple intracranial T2 hyperintense white matter lesions. Many of the lesions are also T1 hypointense. There is no evidence of intracranial mass. The ventricles and basal cisterns are unchanged in size and configuration. There is no midline shift or herniation. The major cerebral flow voids are intact. The orbits, skull, paranasal sinuses, and scalp soft tissues are grossly unremarkable.
1. No significant change in the demyelinating lesions.2. No evidence of PML.