1. From the Departments of Radiology (S.v.R., J.v.d.G., R.v.d.B., M.A.v.B.) and Neurology (J.H.), Leiden University Medical Center, Leiden, The Netherlands; the Department of Neurology (J.H.), Rijnland Hospital, Leiderdorp, The Netherlands; the Department of Neuroradiology (J.L.), University Hospital Munich, Munich, Germany; and the Hemorrhagic Stroke Research Program (S.M.G.), Department of Neurology, Massachusetts General Hospital, Boston, Mass.