Answer
MRI provides a reference for multiple-sclerosis activity and may detect PML before symptoms appear. Scan frequency is adjusted according to individual PML risk.
Sources for this answer
- Tysabri 150 mg solution for injection in pre-filled syringe — Current selected SmPCemc · Summary of Product Characteristics
- TYSABRI 300 mg concentrate for solution for infusion — Current selected SmPCemc · Summary of Product Characteristics