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. 2021 Jun 9;11:12138. doi: 10.1038/s41598-021-91744-9

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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3D-CTA reconstructed images showing the vertebral, the basilar arteries, and the Circle of Willis. (a) The yellow arrow illustrates the left dominant VA. The green arrow indicates hypoplastic right VA. (b) The red arrow illustrates termination of left VA as PICA. The blue arrow indicates dominant right VA.