L Pierot1, L Kanagaratnam2, M Gawlitza3, S Soize3, M Dramé2. 1. Faculty of Medicine, University of Reims Champagne-Ardenne, EA 3797 Reims, France; Department of Neuroradiology, University Hospital Reims, Maison-Blanche Hospital, Reims, France. Electronic address: lpierot@gmail.com. 2. Faculty of Medicine, University of Reims Champagne-Ardenne, EA 3797 Reims, France; Department of Research and Public Health, University hospitals of Reims, Robert Debré Hospital, Reims, France. 3. Faculty of Medicine, University of Reims Champagne-Ardenne, EA 3797 Reims, France; Department of Neuroradiology, University Hospital Reims, Maison-Blanche Hospital, Reims, France.