Low grade gliomas constitute a substantial challenge to medical caregivers despite their lack of propensity for hematogenous dissemination, the survival of adults affected with such tumors has not substantially improved with recent advances in anesthetic, neurosurgery, and radiotherapeutic techniques. This study aims at evaluation of the efficacy and toxicity of radiotherapy on the Brian tissue. Primary results have showed that stereotactic radiotherapy may have the same effect of conventional radiotherapy but with less side effects