Fig. 3

Digital subtraction angiogram of the arterial phase of the left carotid artery (a) demonstrated normal findings. During the venous phase of the left carotid artery (b), the hemispheric venous anomaly, dilated ICVs (white arrow), left Labbe’s vein (#), present falcine sinus (arrow head), and vein of Galen varix (white *) are clearly visualized. The double straight sinus can be observed, and the inferior one can be found with stenosis (black *)