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Rapid shunting from multiple dilated arteries (lateral view of left vertebral artery injection)

Lateral view of a left vertebral artery injection demonstrating rapid shunting from multiple dilated arteries into an enlarged venous structure, with subsequent cephalad drainage into the superior sagittal sinus. Note the absence of the straight sinus in this patient with a choroidal type vein of Galen malformation. (Contributed by Dr. Steven Chang.)