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. 2021 Feb 6;18(7):1699–1710. doi: 10.7150/ijms.54891

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Rare variations in the deep cerebral veins around the VG. A, CTA and MIP show duplicate LDVs (asterisk) draining into the left ICV. B, CTA and MIP show that the LDVs (asterisk) drain into the terminal part of the bilateral ICVs. C, CTA and MIP show a very long VG (41.8 mm) and that the bilateral ICVs merge early. D, An accessory SS (ASS) is noted above the SS, which has the same draining function as the SS. The SS decreases accordingly. The bilateral BVs drain directly into the terminal portion of the SS. Abbreviations: A-P, anterior to posterior; ASS, accessory straight sinus; BV, basal vein; CTA, computed tomography angiography; ICV, internal cerebral vein; MIP, maximum intensity projection; O-I, outside to inside; S-I, superior to inferior; SS, straight sinus; TSV, thalamostriate vein; VG, vein of Galen.