Authors render an account of their four years clinical experiences with linac-based stereotaxic radiosurgery. The first Hungarian stereotaxic radiosurgery team have treated 166 patients between 01. 07. 1991 and 01. 11. 1995: 86 suffered from brain metastases, 13 of them had primary brain tumors 35, benign brain lesions and 32 arteriovenous malformations. The local control rate was found similar to presented in the literature (83, 77, 57 and 82%). During 9 months of median follow up 44% of brain metastatic cases are alive and only 12% died because of cerebral propagation. The primary brain tumors were mostly recurrences (77%) after surgery and/or conventional radiotherapy, 31% died in 11 months of median follow up. Treating benignomas and arteriovenous malformations there was no need for craniotomy at 68 patients. No fatal complications were observed, the rare side-effects seemed to be manageable. The method is an effective possibility for the non-invasive treatment of the above mentioned brain lesions.