circle of Willis


Also found in: Thesaurus, Medical, Financial, Acronyms, Encyclopedia, Wikipedia.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.circle of Willis - a ring of arteries at the base of the brain
arteria, arterial blood vessel, artery - a blood vessel that carries blood from the heart to the body
brain, encephalon - that part of the central nervous system that includes all the higher nervous centers; enclosed within the skull; continuous with the spinal cord
References in periodicals archive ?
Please cite this article as: A Spectacular Endoscopic Anatomy of the Pituitary Gland and the Circle of Willis in a Living Person.
Guidelines for the diagnosis and treatment of spontaneous occlusion of the circle of Willis ('moyamoya' disease).
Evaluation of collateral circulation using magnetic resonance angiography (MRA) is limited to proximal segments of arteries of the circle of Willis [21, 22].
Conclusion: There was a wide variability in the anatomy of the Circle of Willis in Pakistani adults asymptomatic for cerebrovascular disease.
Diagnosis of moyamoya is a challenge itself due to the rarity of the disease and inclusion criteria as outlined by the research committee on spontaneous occlusion of the circle of Willis (moyamoya disease).
HIV-associated intracranial vasculitis has been described as fusiform aneurysms involving the major arteries of the circle of Willis and the second- and third-order branches [9].
This is important because the relative isolation of the MCA territory leaves the cerebral hemisphere ipsilateral to the absent ICA susceptible to injury, due to lack of collateral flow from the circle of Willis. For example, in this case, occlusion of the right ICA could potentially cause infarct in the bilateral MCA territories.
The anterior, middle, and posterior cerebral arteries that emanate from the circle of Willis may show varying degrees of stenosis or occlusion.
The cerebral arterial circle, also known as the circle of Willis, is a complex anastomotic network between the internal carotid artery and vertebrobasilar systems; it is located in the skull base and is home to numerous anatomical variations.
(12.) Fukui M, Members of the Research Committee on Spontaneous Occlusion of the Circle of Willis (Moyamoya Disease) of the Ministry of Health and Welfare.
Henceforth, it is also called circle of Willis (CW).
The moyamoya vessels are the fragile collaterals formed in compensation for this progressive stenosis of the ICA at the base of the brain (at the level of the Circle of Willis).