- a. Disease-Specific Concerns: malignant gliomas graded less than GBM; infratentorial tumor location; recurrent disease; intra-tumoral hemorrhage; Placement of Gliadel® wafers; b. Bevacizumab-Specific Concerns: Inadequately controlled hypertension (defined as systolic blood pressure 150 and/or diastolic blood pressure > 100 mmHg on antihypertensive medications); Any prior history of hypertensive crisis or hypertensive encephalopathy; History of myocardial infarction or unstable angina within 6 months prior to study enrollment; History of stroke or transient ischemic attack within 6 months prior to study enrollment; New York Heart Association (NYHA) Grade II or greater CHF (see Appendix E); Significant vascular disease (e.g., aortic aneurysm, aortic dissection); Symptomatic peripheral vascular disease; Evidence of bleeding diathesis or coagulopathy; History of abdominal fistula, gastrointestinal perforation, or intra-abdominal abscess within 6 months prior to study enrollment; History of intracerebral abscess within 6 months prior to study enrollment; Major surgical procedure, open biopsy, or significant traumatic injury within 28 days prior to study enrollment (exclusive of craniotomy); anticipation of need for major surgical procedure during the course of the study; Core biopsy or other minor surgical procedure, excluding placement of a vascular access device, within 7 days prior to study enrollment; Serious non-healing wound, ulcer, or bone fracture; Proteinuria at screening as demonstrated by either; Urine protein:creatinine (UPC) ratio 1.0 at screening OR Urine dipstick for proteinuria ≥ 2+ (patients discovered to have ≥2+ proteinuria on dipstick urinalysis at baseline should undergo a 24 hour urine collection and must demonstrate ≤ 1g of protein in 24 hours to be eligible); Known hypersensitivity to any component of Avastin. c. General Medical Exclusions