The results of cranial CT (Cranial Computerized Tomography) and MRI (Magnetic resonance imaging) of 25 patients with the diagnosis of ischemic cerebrovascular disease, after coronary by-pass operation that applied to SSK İstanbul Hospital, Neurology Department, between June 1999-July 2000: ıschemic enfarcts in right MCA (Middle Cerebral Artery) in two cases, left MCA in seven cases, right PCA (Posterior Cerebral Artery) in two cases, left ACA (Arterior Cerebral Artery) in one case; lacuner eafarct in nine cases, left thalamic enfarct in one case, left cerebellar enfarct in two cases, brain stem enfarct in two cases, enfarct in basal ganglions in three cases are seen.

At Cranial MR Angiografi; We determined different degrees of stenosis of left MCA in six cases, left ICA (Internal Carotid Artery) in three cases left PCA in four cases, right PCA in one case, left vertebral artery in five cases, right MCA in five cases and right ICA in four cases.

In doppler USG (Ultrasonography) of carotis-vertebral artery results; We determined 60-80 % right ICA stenosis in three cases, 40-50 % right ICA stenosis in three cases, 50-60 % right CCA (Comon Cerebral Artery) stenosis in one case, 0-10 % right ECA (External Carotid Artery) stenosis in one case, 60-80 % left ICA stenosis in two cases, about 100 % left ICA stenosis in two cases and 0-10 % left ICA stenosis in two cases. There were 1 case of which right vertebral artery wasn't seen and 3 cases of which left vertebral artery wasn't seen.

Results: We think that, cranial MR angiography and doppler USG of carotis-vertebral artery researches should be made in early postoperative period in patients who had coronary artery by-pass operation.