1. From the Department of Radiology (M.E.S., S.P.F., S.B., C.B.M.), Academic Medical Center, Amsterdam, The Netherlands; the Department of Radiology (W.J.v.R., M.S.), St Elisabeth Ziekenhuis, Tilburg, The Netherlands; and the Departments of Radiology (G.K.K.) and Neurology (G.J.E.R.), Rudolf Magnus Institute of Neuroscience, Universitair Medisch Centrum, Utrecht, The Netherlands.