Patient with PML (IMAGE) University of Zurich Caption Infection (light zone) in the brain of multiple sclerosis patients suffering from progressive multifocal leukoencephalopathy (PML). Credit (Image: Neuroradiology, USZ). Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.