MRE Scan for the Assessment of Differences in Tissue Stiffness Between Radiation Necrosis and Recurrent Glioma in Patients With Previously Treated Gliomas

Inclusion Criteria * \>/=18 years old. * History of a pathology proven intracranial glioma (including IDH mutant, IDH wildtype or 1p19q co-deleted tumors) treated with chemotherapy and radiation. * The lesion of concern (T2 Flair Hyperintense or contrast enhancing lesion) is \> 2 cm * Patient is able to understand and give consent to participation in the study. Exclusion Criteria * Patients less than 18 years of age. * Pregnant. * Known allergy to gadolinium-based contrast agents. * Renal failure as evidenced by a glomerular filtration rate (GFR) of less than 30 mL/min/1.73m2. * Pacemakers, electronic stimulation, metallic foreign bodies and devices and/or other conditions that are not MR safe, which include but are not limited to: * electronically, magnetically, and mechanically activated implants * ferromagnetic or electronically operated active devices like automatic cardioverter defibrillators and cardiac pacemakers * metallic splinters in the eye * ferromagnetic hemostatic clips in the central nervous system (CNS) or body * cochlear implants * other pacemakers, e.g., for the carotid sinus * insulin pumps and nerve stimulators * non-MR safe lead wires * prosthetic heart valves (if dehiscence is suspected) * non-ferromagnetic stapedial implants * claustrophobia that does not readily respond to oral medication