• The patient must be at least 18 years old
• World Health Organization (WHO)/ Eastern Cooperative OncologyGroup (ECOG) performance status 0-2, Karnofsky score ≥60.
• The patient must be able to understand the information about the treatment and give a written informed consent to participate in the trial.
• Adequate follow-up study must be possible; this will exclude a patient who is uncooperative.
• Must have a life expectancy of at least 3 years based on age and co-morbidities as well as diagnosis. For patients considered for re-irradiation the life expectancy must be estimated to minimum 6 months.
• Must have a pathology proven CNS tumour or if not possible, the radiology findings must be evaluated at a multi-disciplinary conference at a university hospital.
• Women of reproductive potential must agree to use an effective method of contraception during therapy such as an intrauterine device or condom. Pregnancy IS not an ineligibility criteria if radiotherapy is indicated and can-not be postponed.
• Prior CNS radiotherapy is not an ineligibility criteria but re-irradiated patients will be included in a subgroup evaluated separately.

Patients discussed at multidisciplinary conferences at one of the seven university hospitals in Sweden and found candidates for radiotherapy and one of following diagnoses:

• Anaplastic glioma grade III with Loss of Heterozygosity (LOH) 1p/19q and isocitrate dehydrogenase-1 (IDH-1) mutation
• Arteriovenous malformations (AVMs)
• Chordomas and chondrosarcomas
• Craniopharyngiomas
• Ependymomas
• Intracranial germ cell tumours
• Low grade gliomas - grade I-II
• Medulloblastoma, Primitive neuroectodermal tumour (PNET)
• Meningiomas
• Neurocytoma
• Other grade I-II primary CNS tumour according to WHO classification
• Pituitary adenomas
• Schwannomas
• Spinal tumours
• Whenever craniospinal irradiation (CSI) is indicated
• Whenever re-irradiation of CNS is considered