Fig. 2

MRI imaging at diagnosis of PML and follow-up. FLAIR MRI at baseline (left) shows a hyperintense T2 lesion in the left temporooccipital region.2 weeks later (middle), regional progression could be noted and PML was diagnosed. Follow-up upon completion of therapy (right) showed containment of lesion extension and regional atrophy (right image, arrow) along with complete regression of contrast agent extravasation (not shown)