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FIG 2. A, 3D CT angiogram (axial view) and B, MIP image. The left BVR (
) enters the great vein of Galen, but communicates via the uncal vein (
) with the superficial middle cerebral vein (
). The right deep middle cerebral vein (
) joins the superficial middle cerebral vein () and enters the cavernous sinus without forming the anastomosis between the first and second segment. This anastomosis is not visible on the MIP image
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