1 From the Departments of Radiology (R. Pastre, R. Perignon) and Neurology (M.-A.S.), Hospital Emile Roux, Le Puy-en-Velay, France. romain.pastre@ch-lepuy.fr.
2 From the Departments of Radiology (R. Pastre, R. Perignon) and Neurology (M.-A.S.), Hospital Emile Roux, Le Puy-en-Velay, France.