The initial total dose in the target volume (thalamic nuclei complex - VoP and VoA ) will be 70 Gy given in one fraction. The dose will be escalated every 5 Gy and the treatment effect and possible side effects will be evaluated. Dose escalation will be finished at a dose at which the effect of treatment will be satisfactory, or if side effects are unacceptable. The highest dose tested dose will be 110 Gy. Three patients will be irradiated with particular doses and observed at least 3 moths; then study will be continued.