[Dynamics of changes in the cellularity of the vascular endothelium in the brain of rats following local irradiation].

Dynamics of changes in endothelium cellularity of rat brain vessels was studied during 12 months following local irradiation with a dose of 25 Gy that approximated the therapeutic one by its efficacy. A 15 per cent decrease in the endothelium cellularity was registered 24 h after irradiation followed by a slow 40 per cent depletion of the population at a constant rate up to the 6th month. By month 10 the cellularity was restored and after 12 months it dropped again drastically.