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The study included 76 patients with ischemic stroke in the carotid system (56 patients) and in the vertebrobasilar system (20 patients). The magnetic resonance angiography (MRA) revealed congenital anomalies of Willis circle in 31 patients. These anomalies were stratified as follows: back trifurcation of the internal carotid artery (ICA) (19 patients), anterior trifurcation of the ICA (4 patients), the combination of anterior trifurcation of the one of ICA and posterior trifurcation of the other ICA (4 patients), double back trifurcation of ICA (2 patients), the normal structure of the circle of Willis (45 patients). Patients with anomalies of the circle of Willis scored significantly higher on the Neurological deficit scale NIH-NINDS. Despite the lack of significant differences in the size of lesions in 2 groups, the foci in patients with the abnormalities of the circle of Willis were frequently localized in adjacent blood supply zones. The signs of vascular encephalopathy were seen as well. The data obtained suggest that the presence of anomalies in the circle of Willis is a risk factor, together with in the additional adversities, including iatrogenic factor, for the development of hemodynamic ischemic stroke.