DISEASE CHARACTERISTICS:

• Histologically confirmed supratentorial glioblastoma multiforme by stereotactic biopsy, open biopsy, or resection
• Maximum diameter of the tumor mass must be no greater than 4 cm in any dimension, including following debulking surgery AND
• Tumor must be at least 1.0 cm from the optic chiasm and brainstem
• No oligodendrogliomas, meningiomas, or grade I, II, or III astrocytomas
• No infratentorial tumors
• No multifocal glioblastoma multiforme
• Tumor enhances on MRI
• Must have visible tumor on postoperative MRI following surgical resection

PATIENT CHARACTERISTICS:

Age:

• 18 and over

Performance status:

• Karnofsky 60-100%

Life expectancy:

• At least 3 months

Hematopoietic:

• Hemoglobin at least 10.0 g/dL
• Absolute neutrophil count at least 1,500/mm^3
• Platelet count at least 100,000/mm^3

Hepatic:

• Bilirubin no greater than 1.5 mg/dL
• SGPT no greater than 60 U/L

Renal:

• Creatinine no greater than 1.3 mg/dL
• Blood urea nitrogen no greater than 24 mg/dL

Other:

• Neurological function status 0-3
• No evidence of neuropathy
• No glucose-6-phosphate dehydrogenase deficiency
• No known history of porphyria
• History of prior malignancies allowed
• HIV positive status allowed
• No medical contraindication to MRI imaging (i.e., pacemaker, aneurysm clip, or nonsecure metal fragment close to a critical structure)
• Not pregnant or nursing
• Negative pregnancy test
• Fertile patients must use effective contraception prior to and during study

PRIOR CONCURRENT THERAPY:

Biologic therapy:

• Not specified

Chemotherapy:

• At least 6 weeks since prior chemotherapy

Endocrine therapy:

• Concurrent steroids allowed

Radiotherapy:

• No prior radiotherapy to the brain or upper neck

Surgery:

• See Disease Characteristics
• No greater than 5 weeks since prior surgery and recovered