Pediatric patients with primary CNS tumors should be treated by 3D conformal radiation therapy techniques as it allows better sparing of risk organs Although the results of the current study were not statistically significant, but more number of patients and longer follow-up period may show statistical differences between both arms in favour of the 3D conformal arm. Base-line organ function should be obtained prior to surgery as many patients may have affection of one or more of these functions prior to beginning of radiation therapy and this may lead to overestimation of the late effects of radiotherapy. More sophisticated radiation therapy techniques, e.g: IMRT and proton radiotherapy are expected to lower radiation dose to risk organs in close proximity to the target volume and thus will lower treatment morbidity