MRI assessment
gadolinium-enhancing lesions, T2 lesion
During the 2-year follow-up, no unexpected findings were detected via MRI. Six patients (50%) developed new brain T2 lesions in the follow-up period (mean increase of T2 lesion volume in the 2-year follow-up ± s.d. = 1.1 ± 0.82 ml), three of which displayed gadolinium-enhancing lesions (GELs). The injected 