1. From the Departments of Neuroradiology (B.L., G.R.) and Neurosurgery (M.B., O.D.), Erasme University Hospital, Brussels, Belgium; the Department of Radiology (L.C.), CHR Citadelle, Liège, Belgium; and the Department of Neuroradiology (X.L., J.P.P.), Roger Salengro University Hospital, Lille, France.