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BVR variants in CTA. (A) CTA showing the normal pattern of deep veins, bilateral ICVs and BVRs that flow into the vein of Galen. (B,C) CTA showing the BVR that flowed into the straight sinus. BVR, Basal vein of Rosenthal; CTA, computed tomography angiography; ICV, internal cerebral vein, SS, straight sinus.
