1 Dept. of Neuroradiology, Medical Center, University of Freiburg, Breisacher Straße 64, 79106, Freiburg im Breisgau, Germany.
2 Dept. of Neuropathology, University of Freiburg, Breisacher Straße 64, 79106, Freiburg im Breisgau, Germany.
3 Dept. of Neuroradiology, Medical Center, University of Freiburg, Breisacher Straße 64, 79106, Freiburg im Breisgau, Germany. horst.urbach@uniklinik-freiburg.de.