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. 2021 Jul 14;92(9):918–926. doi: 10.1136/jnnp-2020-325881

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© Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution 4.0 Unported (CC BY 4.0) license, which permits others to copy, redistribute, remix, transform and build upon this work for any purpose, provided the original work is properly cited, a link to the licence is given, and indication of whether changes were made. See: https://creativecommons.org/licenses/by/4.0/.

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Analysis comparing visual snow syndrome (VSS) patients versus migraine patients versus healthy controls (Ctrls), showing two clusters of increased regional cerebral blood flow in VSS patients imposed over a glass brain (A) and standard T1 image (B). Clusters are located in the right precentral gyrus (x=54, y=6, z=28; T=4.40; k =420; p=0.001) and right precuneus (x=34, y=−56, z=50; T=4.04; k=404; p=0.001). A comparative image (C) with the whole-brain analysis between VSS patients and Ctrls shows that the two clusters overlap the significant areas previously found. SVC, small volume correction.