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Types of the cerebral arterial circle (circle of Willis) in a Sri Lankan Population by K Ranil D De Silva; Rukmal Silva; Dhammika Amaratunga; WSL Gunasekera; Rohan W Jayesekera is a Medicine article available to read on EtoBox.

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## Background The variations of the circle of Willis (CW) are clinically important as patients with effective collateral circulations have a lower risk of transient ischemic attack and stroke than those with ineffective collaterals. The aim of the present cadaveric study was to investigate the anatomical variations of the CW and to compare the frequency of prevalence of the different variations with previous autopsy studies as variations in the anatomy of the CW as a whole have not been studied in the Indian subcontinent. ## Methods The external diameter of all the arteries forming the CW in 225 normal Sri Lankan adult cadaver brains was measured using a calibrated grid to determine the prevalence in the variation in CW. Chisquared tests and a correspondence analysis were performed to compare the relative frequencies of prevalence of anatomical variations in the CW across 6 studies of diverse ethnic populations. ## Results We report 15 types of variations of CW out of 22 types previously described and one additional type: hypoplastic precommunicating part of the anterior cerebral arteries (A1) and contralateral posterior communicating arteries (PcoA) 5(2%). Statistically significan

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Author

K Ranil D De Silva; Rukmal Silva; Dhammika Amaratunga; WSL Gunasekera; Rohan W Jayesekera

Publisher

BioMed Central; Springer (Biomed Central Ltd.); London: BioMed Central, 2001-; Springer Science and Business Media LLC; Society for Mining, Metallurgy and Exploration Inc. (ISSN 1471-2377)

Published

2011

Language

EN

Field

Medicine (Health Sciences)