Progressive Multifocal Leukoencephalopathy in a Multiple Sclerosis Patient Diagnosed after Switching from Natalizumab to Fingolimod

Figure 2

Signs of IRIS at the time of PML diagnosis. 1.5 T T1w Gadolinium enhanced MR images are presented. Extensive Gadolinium enhancement suggestive of IRIS (black arrows) was observed at the edge of confluent PML lesions.