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. 2019 Aug 20;19:201. doi: 10.1186/s12883-019-1425-0

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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. 2 — DSA discovered a collateral circulation pathway that supplied ipsilateral ICA after CCAO. This was a right (ipsilateral) subclavian artery angiography (lateral position, arterial phase). Right CCA was occluded. The collateral circulation pathway was: right vertebral artery (arrow^①) – right occipital artery (arrow^②) – right ECA (retrograde, arrow^③) – right ICA (arrow^④)