Inclusion Criteria:

          -  Diagnosis of intra-axial brain tumor at initial diagnosis or patients with known
             treated brain tumors on follow-up with concern for imaging progression

          -  Ability to understand and the willingness to sign a written informed consent document,
             or, in cases where the patient may have cognitive impairment, consent by a legal
             authorized representative or power of attorney

        Exclusion Criteria:

          -  Patients with ferromagnetic or otherwise non-MRI compatible aneurysm clips.

          -  The presence of an implanted pacemaker or implanted defibrillator device.

          -  Patients with contraindications for MRI due to embedded foreign metallic objects.
             Bullets, shrapnel, metalwork fragments, or other metallic material adds unnecessary
             risk to the patient.

          -  Pregnancy. Regular clinical practice already excludes pregnant patients from
             gadolinium contrast.

          -  Implanted medical device not described above that is not MRI-compatible.

          -  Known history of severe claustrophobia.

          -  Prisoners and members of other vulnerable populations will be excluded from this
             study. The subject selection population will not regularly include prisoners and other
             vulnerable population members as these populations will not provide any additional
             unique information to or uniquely benefit from the study. Non-English speaking
             population will be excluded from the study due to lack of sufficient resources to pay
             for translator and interpreter services.

          -  Minors will be excluded.