Circle of Willis variations and artery diameter measurements in the Turkish population

Yeniçeri, İbrahim Önder; Çullu, Neşat; Deveer, Mehmet; Yeniçeri, Emine Neşe

doi:10.5603/fm.a2017.0004

Cited by 28 publications

(30 citation statements)

References 5 publications

(11 reference statements)

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“…We found that variations were more frequent in the posterior circulation, the PCoA was the most variable artery, and the most common change was hypoplasia, followed by accessory vessels and arteries with atypical origin. Our results are in line with those of previous studies conducted on larger numbers of cadaveric specimens (21,23,24,30,32), and in vivo studies using magnetic resonance (MR) (19,22,39), or computed tomography (CT) angiography (41). In previous imaging-based studies, the frequency of absent vessels was higher than in our study and other previous cadaveric studies.…”

Section: █ Discussionsupporting

confidence: 92%

“…The diameters of the arteries provided by our study are consistent with those of other cadaveric studies (22), but they are not comparable with those of imaging studies as we measured outer diameters whereas imaging studies measure the diameter of the blood column. Except for the ICA, the diameters in our study are almost double-sized compared to those reported in a previous MR angiography study (39). Since our study was conducted on cadaver brains without cerebrovascular pathology, a direct link between the modified geometry and the appearance of neurological pathology could not be demonstrated.…”

Section: █ Discussioncontrasting

confidence: 65%

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The geometry of the circle of willis anatomical variants as a potential cerebrovascular risk factor

Paşcalău¹,

Padurean²,

Bartoş³

et al. 2018

Turkish Neurosurgery

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Section: █ Discussionsupporting

confidence: 92%

Section: █ Discussioncontrasting

confidence: 65%

The geometry of the circle of willis anatomical variants as a potential cerebrovascular risk factor

Paşcalău¹,

Padurean²,

Bartoş³

et al. 2018

Turkish Neurosurgery

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“…The proximal segment of anterior cerebral artery (A1) supplies the basal surface of the cerebral hemisphere. The diameter of A1 according to Kamath et al [10], 2.3 mm for diameter and 14.25 mm length, Iqbal et al [8] diameter 2.3 mm and length 12.4 mm, on Turkish population length of A1 is 14.4 mm [11] while diameter 1.58 mm in the right A1, 1.64 mm in the left A1 [18], in Kosovo's population the diameters of A1 was 2.09 mm while length 13.96 mm [16]. In our study the diameter of ACA was 2.05 and length 14.01 mm.…”

Section: Discussionmentioning

confidence: 99%

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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“…Typical vessel sizes and past CFD simulations were considered when deciding on vessel diameters and idealized geometries used in this study [12][16] [20][21]. Models were constructed similarly in a commercially available CAD software.…”

Section: Vessel Representationmentioning

confidence: 99%

Simulating Coil Embolization Treatments of Intracranial Aneurysms Using Computational Fluid Dynamics

Tulshibagwale

Gent

2019

2019 Design of Medical Devices Conference

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In this study, a commercially available computational fluid dynamics (CFD) program was used to simulate coil embolization techniques, standard coiling (SC) and stent-assisted coiling (SAC), in simplified vessels that are representative of vessels found in the brain. The test models included a curved vessel, ranging from 3mm to 4mm in diameter. The vessel was afflicted with a spherical aneurysm, ranging from 8mm to 16mm in diameter. The four test cases were simulated without treatment, with SC treatment, and with SAC treatment, for a total of twelve simulations. The parameters of interest were blood volume flow into aneurysm, fluid velocity, wall shear stress (WSS), and vorticity. Results of the simulations indicate, on average, SC and SAC reduced volume flow into the aneurysm by 50% and to over 60%, respectively. Both SC and SAC appeared to reduce distal neck WSS. Both treatments reduced average overall dome WSS by approximately 76%. Average aneurysm neck velocity was reduced by both treatments; SC reduced neck velocity by 69% and SAC reduced neck velocity by 75%. Information on SC and SAC efficacy in idealized scenarios could assist medical professionals determining viable approaches for patient-specific cases and lays foundation for future CFD studies exploring coil embolization treatments.

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Circle of Willis variations and artery diameter measurements in the Turkish population

Cited by 28 publications

References 5 publications

The geometry of the circle of willis anatomical variants as a potential cerebrovascular risk factor

The geometry of the circle of willis anatomical variants as a potential cerebrovascular risk factor

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

Simulating Coil Embolization Treatments of Intracranial Aneurysms Using Computational Fluid Dynamics

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