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. 2021 Mar 11;11:5641. doi: 10.1038/s41598-021-84269-8

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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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Prominent vessel sign was not displayed in a patient with perforator occlusion in the anterior circulation. DWI (A,B) showed lacunar infarction in the left paraventricular region. Large vessel occlusion was not seen on MRA (C) and 3D-SPACE (D). The MTT (E) and TTP (F) maps indicated a small area of hypoperfusion near the left lateral ventricle. There was no prominent vessel sign on SWI (G–I).