RATIONALE: Specialized radiation therapy, such as proton beam radiation therapy, that delivers a high dose of radiation directly to the tumor may kill more tumor cells and cause less damage to normal tissue. PURPOSE: This phase I/II trial is studying the best way to give proton beam radiation therapy and to see how well it works in treating patients with low grade gliomas.
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Feasibility (phase I)
Acute toxicity as assessed by NCI CTC version 3.0 (phases I and II)
Timeframe: 60 days (phase I) or 90 days (phase II) from completion of radiation therapy