circle of Willis


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  • noun

Words related to circle of Willis

a ring of arteries at the base of the brain

References in periodicals archive ?
By establishing the shunt between the carotid artery and femoral vein, blood from the opposite side of the brain via the Circle of Willis and collateral vessels is redirected to the lower pressure venous return.
Our ability to visualize the Circle of Willis (a group of arteries surrounding the base of the brain) and the distal vessels of the brain are substantially improved with the LightSpeed VCT," said Suresh Mukherji, M.
This is especially important in whole-head CT perfusion, elimination of venous contamination as well as multi-phasic cerebral CT angiography (CTA), and retrospectively gated circle of Willis CTA.
In other words, if the vessels are occluded in the neck compensation occurs through the circle of Willis, but if the occlusion occurs distal to the circle of Willis the collateralisation is extremely poor.
Magnetic resonance arteriography and magnetic resonance venography showed that the circle of Willis was patent, as were the internal and external jugular veins bilaterally.