1. From the Department of Neurology and Stroke Centre (P.C.L., E.M., H.A., P.A.), Bichat University Hospital and Medical School; the Department of Neuroradiology (M.M., J.-P.S.-M., E.H.), Lariboisiere University Hospital and Medical School; and the Department of Radiology (I.F.K.), Bichat University Hospital and Medical School, Paris, France.