الفهرس 
ANATOMYOnly 14 pages are availabe for public view
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Abstract
S
troke occurs when the blood supply to the brain is cut off, usually due to a blood vessel burst or being blocked by a clot. This reduces the supply of oxygen and nutrients, causing brain tissue damage. The effects of a stroke depend on which part of the brain is injured. For this purpose, thrombus assessment in patients with acute stroke is of major clinical relevance since the location of the thrombus may determine the therapeutic decisions.
TOF MRA is a frequently used imaging modality in the evaluation of acute stroke patients and can demonstrate stenosis or occlusion in the major intracranial arteries.
In our study by using MRA, we demonstrated the high percentage of posterior circulation anatomical variations in patients with posterior acute ischemic fossa stroke at either same side of variations or contralateral side.
In our study, we demonstrated vertebral artery asymmetry is the most common anatomical variation of whole posterior circulation and highly association of VAH in patients with fetal origin of PCA.
The clinicians should be aware of the high incidence of posterior circulation anatomical variations in patients with posterior fossa stroke and not these variations should be considered independent risk factor for stroke.