[The efficacy of gamma teletherapy in the combined treatment of medulloblastomas in the posterior cranial fossa of children].

The results of radiation therapy conducted after various schemes were compared in 77 patients operated on for medulloblastoma of the posterior cranial fossa: 1. irradiation of the posterior cranial fossa area; 2. irradiation of this area and the entire length of the spinal marrow; 3. total irradiation of the CNS. Stages in a metastatic process necessitate irradiation in stages, i.e. irradiation of the posterior cranial fossa and the length of the spinal marrow followed by irradiation of the cerebral hemispheres one year after the operation. Total irradiation of the CNS shortly after the operation is recommended only in the presence of early metastases.