MRI and Diffusion Imaging of Eloquent Brain Areas to Optimize Brain Tumor Resection Planning

W/I approx 4-6 weeks of the fMRI, DTI \& DSI, neurological/physical testing \& brain MRI showing tumor \&/or edema located in or near (\<2 cm) the motor cortex (precentral gyrus), motor pathway (corticospinal tract), language cortex (Broca's area, Wernicke's area), \&/or language pathway (arcuate fasciculus) Preoperative MRI for surgical planning (approximately \<48 hours before surgery\*) fMRI to localize gray matter DTI, DSI \& tractography to localize white matter, DSI \& updated fMRI (Optional) Most patients will undergo surgery w/i 48 hrs of their preoperative MRI. For some patients, the MRI results will be used for preoperative counseling. In this subset of patients, we expect that surgery will occur w/i 3-4 months of the MRI. Brain tumor resection as per the treating neurosurgeon Electrical stimulation to localize gray \&/or white matter structures if clinically necessary according to the standard of care at MSKCC Postoperative neurological/physical examination (\<48 hours after surgery)