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. 2019 Dec 26;19:99. doi: 10.1186/s12880-019-0388-3

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Example of complete and incomplete artery configuration of basilar artery. Case 1: the complete configuration of BA. a: the normal right VA with severe tortuosity of the first segment; b: normal left VA with severe stenosis of BA; c: HRMRI showing intraplaque hemorrhage of BA plaque on T1 weight imaging. Case 2: the incomplete distal configuration of BA. d: right VA angiography showing severe stenosis of BA without left PCA. e: left common carotid artery angiography showing fetal type PCA. f: HRMRI showing strong enhancement of BA plaque. Case 3: the incomplete proximal configuration of BA. G: dominant VA angiography showing severe stenosis of BA. H: CT angiography showing right VA hypoplasia. I: HRMRI showing intraplaque hemorrhage of BA plaque on T1 weight imaging