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. 2021 Jan 18;1(3):CASE2085. doi: 10.3171/CASE2085

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© 2021 The authors,

CC BY-NC-ND 4.0 (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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FIG. 1. — Left VA injection (A) prior to head rotation for craniotomy. Normal flow is seen in V₂, V₃, and V₄ segments, and a prominent muscular branch (white arrow) is noted. 3D DSA of left VA injection (B) shows a multihole pial AVF (white arrowheads) and demonstrates that the presumed muscular branch (white arrows) connects the V₂ and V₄ segments. Intraoperative left VA injection with head rotation for the transcallosal approach (C) shows occlusion of the V₃ segment with “jump” collateral filling of V₄ via the collateral branch (white arrow).