“…Treatment planning was performed on a three-dimensional CT data cube generated from continuous 3-mm CT scans. MRIs were obtained in treatment position and stereotactically fused to the CT. For treatment planning, the three-dimensional planning system Voxelplan/dkfz (available as Virtuoso, Leibinger Co, Freiburg, Germany) was used [6,17,37]. The planning target volume (PTV) included the macroscopic tumor visible on MRI with a safety margin of 1-2 mm to the brain tissue, 3 mm to adjacent osseous structures, and 5 mm along the dura.…”