circle of willis
Influence of Circle of Willis Configuration on the
... Circle of Willis configuration types – group of patients with multiple aneurysms. Thirty-six (72%) ruptured aneurysms which were 159[r] ...
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Are the Variants of the Circle of Willis Determined by Genetic or Environmental Factors? Results of a Twin Study and Review of the Literature
... Background: Anatomic variants of the circle of Willis (CW) are commonly observed in healthy subjects. Ge- netic and environmental factors influencing these variants remain unclear. Our aim was to assess the ...
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Anatomic evaluation of the circle of Willis: MR angiography versus intraarterial digital subtraction angiography
... the circle of ...the circle of Willis were determined to be present, partially present, or absent by blinded observers evaluating MR angiographic source images and maximum intensity projection ...the ...
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Transcranial color coded duplex sonography in the evaluation of collateral flow through the circle of Willis
... rial circle at the base of the brain, many studies have shown its role as a principal collateral channel to compensate for stenoses and occlu- sions of the carotid arteries (1– ...the circle of ...
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Evaluation of the circle of Willis with three dimensional CT angiography in patients with suspected intracranial aneurysms
... The most experienced reader interpreted the CT an- giography before the angiogram in all but two cases. The other observers were blinded to the result and existence of the angiogram in all cases. All three observers ...
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Anatomical variations of posterior cerebral and posterior communicating artery of circle of willis – a cadaveric study
... the circle in their formation, development and size ...arterial circle, which is associated with alteration of blood flow to the brain, enhances the problem in the vascular diseases of the brain ...arterial ...
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Relationship between Variations in the Circle of Willis and Flow Rates in Internal Carotid and Basilar Arteries Determined by Means of Magnetic Resonance Imaging with Semiautomated Lumen Segmentation: Reference Data from 125 Healthy Volunteers
... Estimated Distribution of Flow to Efferent Arteries Distribution of flow to efferent arteries of the circle of Willis, such as the anterior, middle, and posterior cerebral arteries, can be estimated and ...
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Configuration of the circle of Willis and its two parts among Egyptian: a magnetic resonance angiographic study
... anterior part of circle of Willis; a. A single anterior communicating artery (AcomA). The internal carotid artery (ICA) bifurcates into the precommunicating segment of the anterior cerebral artery (ACA) and ...
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A computational model study of the influence of the anatomy of the circle of willis on cerebral hyperperfusion following carotid artery surgery
... Clinical studies [2,7] have identified some risk factors for CHS or cerebral hyperper- fusion, such as hypertension, high-grade ICA stenosis, decreased cerebral vasoreactivity and contralateral ICA stenosis. Most of ...
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Effects of Circle of Willis Anatomic Variations on Angiographic and Clinical Outcomes of Coiled Anterior Communicating Artery Aneurysms
... A1-dominant circle of Willis configurations (one A1 supplying both A2 arteries) with incom- plete occlusion at baseline may be less stable at follow-up than A1 codominant AcomA aneurysms, similar to other ...
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Original Article Magnetic resonance angiography (MRA) study of morphology and hemodynamics of circle of Willis in patients with transient ischemic attack (TIA)
... the circle of Willis is divided into the anterior and posterior ...anterior circle in- cludes the bilateral ICA, ACOA, and A1 segment of bilateral ACA; the posterior circle includes the ...
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Relationship Between Circle of Willis Morphology on 3D Time of Flight MR Angiograms and Transient Ischemia During Vascular Clamping of the Internal Carotid Artery During Carotid Endarterectomy
... Preoperative MR angiography was performed with two 1.5-T MR imaging systems (Magnetom Vision; Siemens, Er- langen, Germany and Signa CVi; GE Medical System, Milwau- kee, WI). In all patients, 3D TOF MR angiography of the ...
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Aneurysmal Parent Artery–Specific Inflow Conditions for Complete and Incomplete Circle of Willis Configurations
... BACKGROUND AND PURPOSE: Hemodynamics are thought to play a role in intracranial aneurysm growth and rupture. Computational fluid dynamics is frequently performed to assess intra-aneurysmal hemodynamics, using generalized ...
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RESEARCH ARTICLE MRA-based evaluation of anatomical variation of circle of Willis in adult Pakistanis
... Methods: This descriptive cross-sectional study was conducted at the Radiology Department of Dow University of Health Sciences / Civil Hospital, Karachi, from January to December 2016, and comprised patients referred for ...
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A 3D numerical study of the collateral capacity of the circle of Willis with anatomical variation in the posterior circulation
... The circle of Willis (CoW) is a ring-like arterial structure, and it links the two main cerebral artery systems, namely the internal carotid artery system and the vertebrobasilar system, and it is also the ...
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A study of circle of willis with its variations and its clinical correlations
... brains showed complete Circle of Willis. The most common anomaly is the abnormal diameter of the arteries and is found to be more frequent in the posterior communicating artery. The second most common ...
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Experimental study of hemodynamics in the circle of willis
... Moreover, details of the collateral mechanism of complete circle and incomplete circle are remaining debatable. Conflicting results have been reported on the flow patterns in the communicating arteries and ...
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Types of the cerebral arterial circle (circle of Willis) in a Sri Lankan Population
... Based on anatomical [1-4] and radiological studies [5-8], it has been shown that more than 50% of healthy con- trol subjects have anatomical variations in the circle of Willis (CW). Comparisons based on ...
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Circle of Willis variations and artery diameter measurements in the Turkish population
... Circle of Willis variations have been examined in various populations and age groups [1, 5, 7]. How- ever, the age groups in the study populations were extremely large; they also included the elderly. There ...
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Cerebral cross-perfusion and the Circle of Willis: does physiology trump anatomy?
... easily be performed if the procedure is done under LA and with the application of a hemostatic clamp or an occlusive balloon at the ICA origin. Certainly, the initial John Radcliffe Hospital experience with shunt rates ...
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