Prevalence of typical circle of Willis and the variation in the anterior communicating artery: A study of a Sri Lankan population

Silva, K Ranil D De; Silva, Rukmal; Gunasekera, Wiranthi; Jayesekera, R W

doi:10.4103/0972-2327.56314

Cited by 41 publications

(28 citation statements)

References 27 publications

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“…Fetal or embryonic configuration diameter of the P1 is smaller than diameter of P Com A and P2. [ 9 ] In previous studies, the prevalence of a complete anterior circle varied from 74 to 90% in different ethnic groups,[ 9 35 36 37 ] almost similar to our observation. Autopsy studies, however, showed lower incidence of complete circles.…”

Section: Discussionsupporting

confidence: 91%

Magnetic resonance angiographic evaluation of circle of Willis: A morphologic study in a tertiary hospital set up

Naveen¹,

Bhat²,

Karthik³

2015

Ann Indian Acad Neurol

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Background:Anatomy of circle of Willis (CW) shows wide variation in different individuals, population groups, and has vital clinical significance in causation and presentation of clinical disease. This study evaluates the anatomical variations, incidence of various common anomalies of CW in south Indian tertiary hospital set up, using three-dimensional time-of-flight (3D-TOF) magnetic resonance angiography (MRA).Materials and Methods:A total of 300 patients referred for neuroimaging study over a period of 2-year were included in the analysis. In this prospective and retrospective study, 198 men and 102 women; mean age, 55 years) underwent 3D-TOF MR angiograms of the CW using a 1.5-tesla MR scanner. Images were reviewed for anatomical configuration of the CW using maximum intensity projection (MIP) and 3D volume rendered images.Results:On analysis, a complete CW was seen in 50 (16.6%) of 300 subjects. An incomplete anterior and posterior CW was found in 66 (22%) The remaining 184 (61.3%) subjects had partially complete CW configuration. The most common type of CW in a single subject was anterior variant type A and posterior type variant E.Conclusion:We observed wide variation in CW configuration in our patients. The prevalence of complete configuration of the circle is 16.6%; slightly higher in females and younger subjects. Complete anterior circle was present in 77.3%. Most common anterior variant is type A (normal anterior configuration) with a prevalence of 66%. The most common posterior circle variant is type E (hypoplasia or absence of both PcomA) with 32.6%. Overall, CW variants are slightly more common among the women in comparison to men. Incidence of associated anomalies like aneurysm or arteriovenous malformation (AVM) was comparable to that described in literature.

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Section: Discussionsupporting

confidence: 91%

Magnetic resonance angiographic evaluation of circle of Willis: A morphologic study in a tertiary hospital set up

Naveen¹,

Bhat²,

Karthik³

2015

Ann Indian Acad Neurol

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“…The absence of ACA-A1 of one side is present in 5.6% or 29 examined cases, almost proportionally in women 6.75% and in male 4.8% comparing to 4% [7], 4.76% [9] and 5% [2]. Median ACA is presented in 11 examined patients or 2.1%, in women 2.4% and in men 1.8%, similar results are 2.5% and 5%…”

Section: Discussionsupporting

confidence: 53%

Anatomical variations and dimensions of arteries in the anterior part of the circle of Willis

et al. 2019

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Background: The aim of this study was to investigate different anatomic variations and dimensions of anterior part of the circle of Willis (CW) and their prevalence on Kosovo's population. Materials and methods: This is an observational descriptive and retrospective study performed at the University Clinical Centre, Clinic of Radiology. The three-dimensional time-of-flight technique was used for magnetic resonance angiography imaging to evaluate the anatomy of the CW in 513 adults without clinical manifestations for cerebrovascular disease. The diameters of arteries of the CW were measured and variations were recorded. Results: The complete anterior part of CW was found in 64.3% of cases, more evident in female at about 66% than male 62.2%. Morphologic variations of the ACA1 are agenesis or hypoplasia in 5.65%, fusion of the anterior cerebral arteries (ACAs) on a short distance in 6.5% and fusion of the ACA on a long distance in 2.5%, median ACA is presented in 11 examined patients or 2.1%. Normal anterior communicating artery (ACoA) was seen in 68.2%, hypoplasia or absence 15.66%, double ACoA in 0.6% and fenestrations in 3.89%. The mean calibrations of the vessels were measured as 2.04 mm in right A1, 2.06 mm in left A1 and 1.16 mm of ACoA. While, 14.1 mm length of right A1, 13.87 mm of left A1 and 2.99 mm of ACoA. Conclusions: Knowledge of the variations and diameter of the anterior part of the CW has a great importance in determination of anatomical variations and diameter in general populations, also, in interventional radiology for various endovascular interventions as well as during anatomy lessons.

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“…Variations in cerebral arteries, particularly in the interhemispheric anterior communicating artery (De Silva et al. ), posterior cerebral arteries, middle cerebral arteries (Gunnal et al. ), bilateral PComA (Chuang et al.…”

Section: Discussionmentioning

confidence: 99%

“…The anterior portion of the cerebral arterial network, the circulus arteriosus cerebri (CAC), first described by a Paduan anatomist Julius Casserius (1552–1616) and subsequently by Thomas Willis (1621–1675), includes the cerebral parts of right and left internal carotid arteries (ICA), pre‐communicating parts of right and left anterior cerebral arteries (ACA), anterior communicating artery (AComA), right and left posterior communicating arteries (PComA), and the pre‐communicating parts of the bilateral posterior cerebral arteries (PCA) (Rogers, ; Feindel, ; De Silva et al. ; Bender et al. ; Vasović et al.…”

Section: Introductionmentioning

confidence: 99%

The cerebral basal arterial network: morphometry of inflow and outflow components

et al. 2017

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The aim of this project was to study how the morphology of the incoming and outgoing arterial components of the cerebral basal arterial network influence the blood flow to the brain. The cerebral basal arterial network consists of the circulus arteriosus cerebri anteriorly and the basilar artery posteriorly. Diameters of inflow vessels (bilateral vertebral and internal carotid arteries), connecting vessels (anterior communicating, basilar and bilateral posterior communicating arteries) and outflow vessels (anterior, middle and posterior cerebral arteries) were measured and cross-sectional areas calculated in 51 cadaveric brain specimens. The individual and the average cross-sectional areas of inflow arteries (51.43 mm ) were significantly bigger than the major outflow arteries (37.76 mm ) but smaller than the combined cross-sectional areas of outflow (37.76 mm ) and connecting (25.33 mm ) arteries. The difference in the size of arterial cross-sectional area and the presence of the connecting arteries in the cerebral basal arterial network provides a mechanism for lowering peaks in pressure, and demonstrates a function of the cerebral basal arterial network.

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Prevalence of typical circle of Willis and the variation in the anterior communicating artery: A study of a Sri Lankan population

Cited by 41 publications

References 27 publications

Magnetic resonance angiographic evaluation of circle of Willis: A morphologic study in a tertiary hospital set up

Magnetic resonance angiographic evaluation of circle of Willis: A morphologic study in a tertiary hospital set up

Anatomical variations and dimensions of arteries in the anterior part of the circle of Willis

The cerebral basal arterial network: morphometry of inflow and outflow components

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