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Magnetic resonance angiography determined variations in the circle of Willis: Analysis of a large series from a single center
OBJECTIVE: The purpose of this study is to evaluate and describe the prevalence and patterns of arterial variants in the circle of Willis (CW) seen in noncontrast three-dimensional time-of-flight magnetic resonance angiography in a series of patients with cerebral vascular accidents (CVAs). MATERIAL...
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Medknow Publications & Media Pvt Ltd
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6334567/ https://www.ncbi.nlm.nih.gov/pubmed/30692833 http://dx.doi.org/10.4103/tcmj.tcmj_167_17 |
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author | Ravikanth, Reddy Philip, Babu |
author_facet | Ravikanth, Reddy Philip, Babu |
author_sort | Ravikanth, Reddy |
collection | PubMed |
description | OBJECTIVE: The purpose of this study is to evaluate and describe the prevalence and patterns of arterial variants in the circle of Willis (CW) seen in noncontrast three-dimensional time-of-flight magnetic resonance angiography in a series of patients with cerebral vascular accidents (CVAs). MATERIALS AND METHODS: A descriptive study was undertaken in 200 patients who presented for screening for CVA in the Department of Radiodiagnosis and Imaging, St. John's Medical College Hospital, Bengaluru, from September 2014 to September 2016. RESULTS: The most common types of CW in a single subject were anterior variant Type A and posterior variant Type E. Type A in the anterior circulation is the normal adult pattern. There is a single anterior communicating artery. The internal carotid artery bifurcates into the precommunicating segment of the anterior cerebral artery and middle cerebral artery. Type E in the posterior circulation is hypoplasia or absence of both posterior communicating arteries and isolation of the anterior and posterior parts of the circle at this level. Overall, CW variants were slightly more common in women than in men. CONCLUSION: Our findings show that the configuration of the CW may vary greatly in the general population. The wide range in the morphology of CW warrants further research on various races and larger populations to confirm the influence of genetic, regional, environmental, and hemodynamic factors or their combination. |
format | Online Article Text |
id | pubmed-6334567 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Medknow Publications & Media Pvt Ltd |
record_format | MEDLINE/PubMed |
spelling | pubmed-63345672019-01-28 Magnetic resonance angiography determined variations in the circle of Willis: Analysis of a large series from a single center Ravikanth, Reddy Philip, Babu Tzu Chi Med J Original Article OBJECTIVE: The purpose of this study is to evaluate and describe the prevalence and patterns of arterial variants in the circle of Willis (CW) seen in noncontrast three-dimensional time-of-flight magnetic resonance angiography in a series of patients with cerebral vascular accidents (CVAs). MATERIALS AND METHODS: A descriptive study was undertaken in 200 patients who presented for screening for CVA in the Department of Radiodiagnosis and Imaging, St. John's Medical College Hospital, Bengaluru, from September 2014 to September 2016. RESULTS: The most common types of CW in a single subject were anterior variant Type A and posterior variant Type E. Type A in the anterior circulation is the normal adult pattern. There is a single anterior communicating artery. The internal carotid artery bifurcates into the precommunicating segment of the anterior cerebral artery and middle cerebral artery. Type E in the posterior circulation is hypoplasia or absence of both posterior communicating arteries and isolation of the anterior and posterior parts of the circle at this level. Overall, CW variants were slightly more common in women than in men. CONCLUSION: Our findings show that the configuration of the CW may vary greatly in the general population. The wide range in the morphology of CW warrants further research on various races and larger populations to confirm the influence of genetic, regional, environmental, and hemodynamic factors or their combination. Medknow Publications & Media Pvt Ltd 2019 /pmc/articles/PMC6334567/ /pubmed/30692833 http://dx.doi.org/10.4103/tcmj.tcmj_167_17 Text en Copyright: © 2018 Tzu Chi Medical Journal http://creativecommons.org/licenses/by-nc-sa/4.0 This is an open access journal, and articles are distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 License, which allows others to remix, tweak, and build upon the work non-commercially, as long as appropriate credit is given and the new creations are licensed under the identical terms. |
spellingShingle | Original Article Ravikanth, Reddy Philip, Babu Magnetic resonance angiography determined variations in the circle of Willis: Analysis of a large series from a single center |
title | Magnetic resonance angiography determined variations in the circle of Willis: Analysis of a large series from a single center |
title_full | Magnetic resonance angiography determined variations in the circle of Willis: Analysis of a large series from a single center |
title_fullStr | Magnetic resonance angiography determined variations in the circle of Willis: Analysis of a large series from a single center |
title_full_unstemmed | Magnetic resonance angiography determined variations in the circle of Willis: Analysis of a large series from a single center |
title_short | Magnetic resonance angiography determined variations in the circle of Willis: Analysis of a large series from a single center |
title_sort | magnetic resonance angiography determined variations in the circle of willis: analysis of a large series from a single center |
topic | Original Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6334567/ https://www.ncbi.nlm.nih.gov/pubmed/30692833 http://dx.doi.org/10.4103/tcmj.tcmj_167_17 |
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