Aphasia/prevention & control; Aphasia/physiopathology; Brain Mapping/methods; Brain Neoplasms/physiopathology; Brain Neoplasms/surgery; Diffusion Tensor Imaging/methods; Glioma/physiopathology; Glioma/surgery; Image Enhancement/methods; Image Interpretation, Computer-Assisted/methods; Imaging, Three-Dimensional/methods; Magnetic Resonance Imaging, Interventional/methods; Neuronavigation/methods; Postoperative Complications/prevention & control; Postoperative Complications/physiopathology; Adult; Aged; Algorithms; Arcuate Nucleus of Hypothalamus/physiopathology; Arcuate Nucleus of Hypothalamus/surgery; Cerebral Cortex/physiopathology; Cerebral Cortex/surgery; Corpus Callosum/physiopathology; Corpus Callosum/surgery; Female; Ganglioglioma/physiopathology; Ganglioglioma/surgery; Glioblastoma/physiopathology; Glioblastoma/surgery; Humans; Male; Middle Aged; Neural Pathways/physiopathology; Neural Pathways/surgery; Oligodendroglioma/physiopathology; Oligodendroglioma/surgery; Preoperative Care/methods