Inclusion Criteria:

          -  Histologically confirmed diagnosis of supratentorial WHO Grade III or IV Glioma (High
             Grade Glioma) that has undergone surgical biopsy or resection followed by adjuvant
             chemoradiotherapy, that has evidence of recurrence or progression based on imaging
             studies and a stereotactic biopsy is indicated for confirmation of
             recurrence/progression.

          -  18 years of age or older

          -  Karnofsky Performance Status 70-100;

          -  MRI demonstration of a stereotactically accessible enhancing or predominantly non-
             enhancing mass that does not require resection to relieve clinically significant mass
             effect;

          -  Participant understands the procedures and agrees to comply with the study
             requirements by providing written informed consent

          -  Adequate organ function as indicated in protocol

        Exclusion Criteria:

          -  Participant is mentally or legally incapacitated at the time of the study;

          -  Known HIV(+) or has been diagnosed with AIDS

          -  Participation in another investigational drug study in the prior 4 weeks

          -  Positive pregnancy test in a female

          -  Patient, in the opinion of the investigator, is likely to be poorly compliant.

          -  Diffuse subependymal or Cerebral Spinal Fluid (CSF) disease

          -  Tumors involving the cerebellum

          -  Tumor enhancement involving both hemispheres

          -  Active infection requiring treatment

          -  Unexplained febrile illness

          -  Radiation or chemotherapy within 4 weeks of enrollment

          -  Systemic diseases associated with unacceptable anesthesia or operative risk

          -  Inability to undergo magnetic resonance imaging (MRI)