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. 2019 Dec 20;10:1278. doi: 10.3389/fneur.2019.01278

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Copyright © 2019 Peeters, Houben, Postma, van Oostenbrugge, Schurgers and Staals.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Examples of different degrees of intracranial carotid artery calcification in the right carotid artery (arrow) on unenhanced bone-window computed tomography (CT) image. (A) Intracranial carotid artery calcification (ICAC) score = 0 (no calcification), (B) ICAC score = 2 (mild, 10–50% of the vessel circumference constituted of calcification), (C) ICAC score = 4 (severe, >90% of the vessel circumference constituted of calcification).