1. From the Institute of Medical Radiology (A.S., G.H.), Department of Pathology (M.K.), and Department of Neurology (S.O.), University Clinic of St Pölten, Propst Führer-Strasse 4, A-3100 St Pölten, Austria; and Departments of Neurosurgery (A.S., M.Z., K.R., M.B.) and Neuroradiology (A.D.), University of Erlangen-Nürnberg, Erlangen, Germany.