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. 2022 Mar 7;22:87. doi: 10.1186/s12893-022-01539-6

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© The Author(s) 2022

Open AccessThis 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/. 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 in a credit line to the data.

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Fig. 2 — The image data of STA-MCA bypass. A Head CT showed infarcts in the left frontal lobe, corona radiata and centrum ovale. B DSA showed occlusion in left ICA. C CTP showed that the perfusion of left hemisphere was lower than that of right hemisphere. D Head CT showed that there was no new infarction or bleeding in the operation area. E CTA showed that the bypass vessels were unobstructed. F CTP showed that the left hemisphere perfusion was better than that before operation. G CTA showed that the bypass vessels were unobstructed after three months of follow-up. H CTP showed that left hemisphere perfusion was further improved after three months of follow-up