Research Procedures: If you qualify to take part in this research study, you will undergo these research procedures: The pre- and post operative MRI (Magnetic Resonance Imaging) scans before and after your operation, the operative procedure (including sampling known as biopsy or removal of as much as tumor as possible) and the procedures to facilitate radiation therapy planning (making a mask in the treatment position to keep you comfortably still and CAT scan in the treatment position). These are all part of standard procedures in the treatment of your tumor, whether you are in this study or not.