[1
]From the Department of Radiology (T.D.F., R.K., G.K., M.P.M., M.W., J.J.H.) and Department
of Neurology and Neurological Sciences (S.C., M.M., M.G.L., G.W.A.), Stanford University
School of Medicine, 300 Pasteur Dr, Room S047, Stanford, CA 94305; and Department
of Neuroradiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany (L.M.,
G.B., F.F., J.F.).