Figure 1.

Classifications of the Basal vein of Rosenthal (BVR) according to the developmental alterations of efferent pathways:A) Telencephalic group, including tributaries of the inferior striatal vein, uncal vein, inferior frontal vein, anterior communicating vein,deep middle cerebral vein (arrows).B) Diencephalic group,including tributaries of the peduncular vein,inferior ventricular vein (arrows), posterior communicating vein. C) Tegmental bridging group of lateromesencephalic vein (LMV) anastomosis (arrows) with superior petrosal sinus. D) Tectal group of superior vermian vein. This figure shows the Galenic connection of the small BVR constituting the superior vermian vein (short arrows) and adjacent posterosuperior cerebellar vein (long arrows).

1, basal vein of Rosenthal (BVR); 2, vein of Galen; 3, deep middle cerebral vein (DMCV); 4, inferior striatal vein; 5, inferior ventricular vein; 6, superior petrosal sinus; 7, choroid plexus.