1German Cancer Research Center (DKFZ), Heidelberg, Germany, 2Medical Physics, University Medical Center Freiburg, Freiburg, Germany, 3Deutsches Konsortium für Translationale Krebsforschung (DKTK), Heidelberg, Germany, 4Neuropathology, University Medical Center Freiburg, Freiburg, Germany, 5Neurosurgery, University Medical Center Freiburg, Freiburg, Germany, 6Neuroradiology, University Medical Center Freiburg, Freiburg, Germany