It was found that cerebral vascular pathology in both masterly arteries meets 2 times more frequently after 60 years, only affecting these arteries apart. The risk factors are diabetes, high blood pressure, hyperlipidemia, which favors occlusive disease. Evolution of the disease and clinics depends on the status of anastomosis between vertebrobasilar and carotid systems, the degree of vessels occlusion and by acute or slow gradually onset of the disease.

S-a constatat că patologia vasculară cerebrală asociată între arterele magistrale se întâlneşte de 2 ori mai frecvent după 60 de ani, decât afectarea acestor artere aparte. Factorii de risc sunt DZ, HTA, hiperlipidemia care favorizează boala ocluzivă. Evoluţia bolii şi tabloul clinic depind de starea anastomozelor dintre sitemul vertebrobazilar şi cel carotidian, gradul de stenozare a vaselor şi debutul acut sau lent progresiv.