1. From the Departments of Neuroradiology (M.E., A.G., W.B.H., G.B., J.B., C.R.R., D.T., J.F.M., C.O., O.N.) and Neurosurgery (F.N.), Université Paris Descartes Sorbonne Paris Cité, INSERM S894, DHU Neurovasc, Centre Hospitalier Sainte-Anne, Service Imagerie Morphologique et Fonctionnelle, 1 rue Cabanis, 75674 Paris Cedex 14, France; and Departments of Radiology and Medical Physics, University of Wisconsin, Madison, Wis (P.T.).