FIG 3. A, 3D CT angiogram (axial view) and B, posteroanterior stereoscopic views. The right anterior cerebral vein () and the deep middle cerebral vein () enter the sphenoparietal sinus via the uncal vein () without forming the anastomosis between the first and second segment, and also communicate through the peduncular vein (>>) with the contralateral BVR and the anterior pontomesencephalic vein (>). The left BVR communicates via the uncal vein () with the cavernous sinus, via the deep middle cerebral vein with the insular vein () and the superficial middle cerebral vein (), via the peduncular vein (>>) with the anterior pontomesencephalic vein (>), and the great vein of Galen posteriorly