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FIG 6. A, 3D CT angiogram (axial, stereoscopic views) and B, posteroanterior stereoscopic views. The bilateral BVRs drain via the lateral mesencephalic vein (
) into the superior petrosal sinus. In the presence of a hypoplastic third segment of the BVR, the right inferior ventricular vein (
) enters the lateral mesencephalic vein. The left third segment enters the great vein of Galen.
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