1. Department of Neurosurgery (J.R., B.C., D.P., P.D., M.D.O., Y.Z., R.J., U.S., K.H.W.), University Hospital Essen, Germany.
2. Clinic for Neuropathology (A.J.), University Hospital Essen, Germany.
3. Department of Diagnostic and Interventional Radiology and Neuroradiology (A.R., M.F.), University Hospital Essen, Germany.
4. Erwin L. Hahn Institute for Magnetic Resonance Imaging, University Duisburg-Essen, Germany (S.M., H.H.Q.).