Ischemic stroke in the vertebrobasilar system. Risk factors, etiology, and localization.

A stenosis of the major intracranial arteries is an important cause of ischemic stroke. Specific neurological deficits may occur due to the localization of infarct induced by ischemia in the carotid or vertebrobasilar circulation. When compared with the carotid system, the vertebrobasilar system (VBS) displays different progress and it undergoes countless variations during fetal development. Congenital variations in the configuration and the