circle of Willis


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circle of Willis

[′sər·kəl əv ′wil·əs]
(anatomy)
A ring of arteries at the base of the cerebrum.
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Keywords: Anatomical variation, Cerebral arteries, Circle of Willis, 3D-TOF MR Angiography, Complete circle, Anterior circulation, Posterior circulation.
Caption: Figure 2: CT angiogram of the circle of Willis showing multiple areas of luminal irregularity.
Collateral circulation to the ipsilateral cerebral hemisphere may be provided by flow through the circle of Willis, persistent fetal vessels, or collaterals from the external carotid artery.
The circle of Willis from 150 adult brains was studied for morphological variations.
Spontaneous occlusion of the circle of Willis. A disease apparently confined to Japanese.
The arterial supply of blood to the brain is protected by a series of connections between the major arteries, termed the "circle of Willis" after the English physician who first described it in the 17th century.
People with migraine, particularly migraine with aura, are more likely to be missing components of the circle of Willis.
Background: The circle of Willis, present in the interpeduncular cistern at the base of the brain, is the major source of blood supply of the brain.
Researchers agree that the circle of Willis is one of the most important parts of the collateral circulatory system of the brain.
Important potential consequences of this fetal variant of the circle of Willis have been demonstrated, but studies are conflicting.
Methodology: The images of diffusion weighted imaging (DWI), DSC and ASL in 36 cases of TIA patients with unilateral MCA stenosis and 35 healthy volunteers were analyzed retrospectively to assess collateral flow in the circle of Willis, and to analyze the perfusion differences between ASL and DSC.
Eighty percent of intracranial aneurysms are located in the anterior circulation (circle of Willis)[2].