Study of anomalies in the circle of Willis using magnetic resonance angiography in north eastern India

Saikia, Bishwajeet; Handique, Akash; Phukan, Pranjal; Lynser, Donboklang; Jamil, Md

doi:10.1016/j.jasi.2014.05.007

Cited by 10 publications

(12 citation statements)

References 17 publications

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“…As for the descriptions of the origin of the left and right ACAs from one ICA, as described by Burbank and Morris [5], and Kawaji et al [23], a persistent POℓA probably assumed the role of the "second" ACA [32,33,52]. Similar descriptions were also found in the articles of Pokhrel and Bhatnagar [40], and Saikia et al [43], but their schema and/or images do not correspond to the text, i.e. these images presented bihemispheric ACAs.…”

Section: Discussionmentioning

confidence: 52%

“…We think that previously cited frequencies of unilateral ACA aplasia should not be taken as xed values, especially because some authors do not distinguish ACA hypoplasia from aplasia [6,8,17,31,43,54], or aplasia from agenesis [8,16,17,23,42]. Wanibuchi et al [54] described A1 hypoplasia in the text, while they marked the same case as "aplasia" in the table.…”

Section: Discussionmentioning

confidence: 99%

“…2, although (hypoplastic) A1 is visible on the right side in the rst image and on the left side in their second image. Furthermore, Chuang et al [8] and Saikia et al [43] recognized hypoplastic A1 if its diameter is either < 1 mm or absent (invisible). Some clinicians pointed out that an acquired occlusion of the A1 segment in elderly patients may be diagnosed as A1 aplasia in the MRA [47], as well as that the presence of the Doppler signal could not exclude the possibility of A1 aplasia in the MRA [28].…”

Section: Discussionmentioning

confidence: 99%

“…Some clinicians pointed out that an acquired occlusion of the A1 segment in elderly patients may be diagnosed as A1 aplasia in the MRA [47], as well as that the presence of the Doppler signal could not exclude the possibility of A1 aplasia in the MRA [28]. According to the fact that there is a di culty in distinguishing aplasia from hypoplasia of the A1 using the MRA or the DSA [8, 17,36,43,54], we strongly believe that the anatomical, forensic or surgical dissections are the only relevant methods to use for their proper distinction and differentiation. In addition, from the anatomical point of view, the hypoplastic ACA is a morphologically formed vessel having its origin, course, distribution of side branches and termination, in contrast to the aplastic vessel.…”

Section: Discussionmentioning

confidence: 99%

“…c Fisher [14] sketched two cases of bilateral partial aplasia of the ACAs in A1 parts. a Literature cases are aligned according to the age of individuals; some cases originated from the retrospective studies, in which A1 aplasia was marked in single angiograms [22,28,43,47,54].…”

Section: Sahmentioning

confidence: 99%

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Unilateral and Bilateral Aplasia of the Anterior Cerebral Artery in the Presence of Their Vascular Sources

Trandafilović

Vasović

Vlajković

et al. 2022

Preprint

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Purpose In continuation of our previous studies of vascular components of the cerebral arterial circle, our goal was to investigate the cases of aplasia of the anterior cerebral artery (ACA). Methods The macro- and microdissection of the target human brain arteries was applied under the magnifying glass. Each case was photographed and diagramatically represented in the workbook. The length and the outer diameter of the corresponding arteries on the photos were measured using a computer software program. Results There were 2/388 cases of ACA aplasia―unilaterally in one case (0.25%), and bilaterally in the other (0.25%). These two cases belonged to a male and a female adult, autopsied due to the homicide and myocardial infarction, aged 68 and 80, respectively. Except for the variations of the posterior communicating artery on one or both sides, and several arteries of the vertebrobasilar system, the instance of cerebral pathology was not recorded in either of these cases. We compared the recent cases with similar literature cases obtained from a number of retrospective studies and single reports. Conclusion Summarizing available literature cases of unilateral ACA aplasia, and taking into account that the presented cases of unilateral and bilateral ACA aplasia were not accompanied with cerebral pathology, we can nevertheless to underline the appearance of an aneurysm of the opposite ACA in more than a quarter of the studied cases, more typically on the right side and in male gender. The recent case of bilateral ACA aplasia which has been the second case discovered so far, represents a true rarity.

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Section: Discussionmentioning

confidence: 52%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Sahmentioning

confidence: 99%

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Unilateral and Bilateral Aplasia of the Anterior Cerebral Artery in the Presence of Their Vascular Sources

Trandafilović

Vasović

Vlajković

et al. 2022

Preprint

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Anatomical variations of the circle of Willis and their prevalence, with a focus on the posterior communicating artery: A literature review and meta‐analysis

et al. 2020

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The circle of Willis is an anastomotic network of arteries surrounding the base of the brain, providing collateral circulation to prevent ischemia. It has, however, long been established that it exhibits considerable anatomical variation when compared to Thomas Willis' originally described circle. This study aimed primarily to determine an accurate prevalence of the variation of the circle of Willis in the general population and the prevalence of common posterior communicating artery variations. Additional aims were to explain why such a wide range of reported variations exist, and whether different types of studies report significantly different prevalence of variation. A comprehensive literature search identified 764 papers. A three‐phase screening process was undertaken, involving a critical analysis of papers, and a total of 33 papers were selected for analysis and literature review. A descriptive statistics test with bootstrap was performed to estimate the average prevalence of variations. The estimated prevalence of general variation, unilateral, and bilateral posterior communicating artery hypoplasia or aplasia was 68.22 ± 14.32%, 19.45 ± 8.63%, and 22.83 ± 14.58%, respectively. Over half of the population exhibit a circle of Willis with some form of variation. To provide a more accurate estimation for the prevalence of variations, a universal classification system needs to be established, collating all the work from high‐quality studies, to provide a comprehensive database of the circle's variations. Knowing the prevalence of variations and how they can impact neurosurgical approaches or patterns of ischemic pathology can be crucial in providing effective patient care.

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MRA study of anatomical variations of circulus arteriosus cerebri in healthy adults of Kosova

Shatri

Çerkezi

Bexheti

2018

The Egyptian Journal of Radiology and Nuclear Medicine

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Study of anomalies in the circle of Willis using magnetic resonance angiography in north eastern India

Cited by 10 publications

References 17 publications

Unilateral and Bilateral Aplasia of the Anterior Cerebral Artery in the Presence of Their Vascular Sources

Unilateral and Bilateral Aplasia of the Anterior Cerebral Artery in the Presence of Their Vascular Sources

Anatomical variations of the circle of Willis and their prevalence, with a focus on the posterior communicating artery: A literature review and meta‐analysis

MRA study of anatomical variations of circulus arteriosus cerebri in healthy adults of Kosova

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