2. General Medical Concerns 18 years of age; Karnofsky performance status > 60; Tumor-related contrast enhancement on initial and post-operative Gd-MRI; Recovery from effects of surgery and/or its complications prior to initiating radiotherapy; Radiotherapy must begin < 5 weeks following surgery; Pre-and post-operative Gd-MRI prior to the initiation of radiotherapy; Adequate hematological, renal, and hepatic function:hemoglobin > 10 grams hematocrit > 30%, platelets > 100,000 per mm3, BUN < 25 mg/dl, Creatinine < 1.5 mg/dl, Total bilirubin < 1.5 mg/dl, SGOT or SGPT < twice institutional normal range, Subjects must not be pregnant or nursing, Use of effective means of contraception (men and women) in subjects of child-bearing (women) and at all ages (men), Study-specific signed informed consent, Ability to comply with study follow-up procedures.