1. From the Department of Radiology (R.E.L.), University of California at Davis, Sacramento; Department of Neurosurgery (W.R.S.), University Hospitals of Cleveland, Ohio; Neuroscience Consultants (T.S.), Richmond, Va; Department of Neurosurgery (M.N.H.), University of Alabama at Birmingham; Neurology Service (L.B.), VA Connecticut Healthcare System, New Haven; Neurology Service (W.K.), Massachusetts General Hospital, Boston; National Institute of Neurological Diseases and Stroke (J.R.M., M.E., M.W., M...