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. 2021 Oct 25;13:720481. doi: 10.3389/fnagi.2021.720481

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Copyright © 2021 Xu, Li, Xing, Song, Chen, Duan and Yang.

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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Deep medullary veins scoring system. (A,E) A score of 0 is assigned for each continuous and prominently visible vein; (B,F) A score of 1 indicates that the vein is continuous and with unequivocal visibility, but at least one vein manifests an inhomogeneous signal; (C,G) A score of 2 indicates that at least one vein is not continuous and is faintly visible, presenting spot-like hypointensities; (D,H) A score of 3 is assigned if no DMVs are visible.