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Magnetic resonance imaging scans during the course of PML and IRIS. Axial reconstructions from 3D Flair acquisition. Routine MRI 1 year before PML diagnosis (A), when PML was diagnosed (B) and subsequent scans directly after plasma exchange (C), 1 week (D), 2 weeks (E), 4 weeks (F), 5 weeks (G), 1.5 months (H), and 2.5 months (I) after plasma exchange. Arrows indicate the PML lesions.
