1. From the Department of Medical Imaging (Y.-J.L., K.G.T., G.S., T.K.), and Division of Neurosurgery (T.K.), Toronto Western Hospital, University of Toronto, Ontario, Canada; Department of Radiology, Hanyang University Hospital, Hanyang University College of Medicine, Seoul, Korea (Y.-J.L.); and Service de Neuroradiologie, CHU Bicêtre, Le Kremlin Bicêtre Cedex, France (G.S.).