Fig 1.

A 23-year-old man with a ruptured small left occipital brain AVM. A, Frontal view of a simultaneous right vertebral and left internal carotid angiogram shows a small occipital AVM with a single dominant feeder from the middle cerebral artery and a single dominant superficial draining vein (arrow). B, Complete obliteration after embolization with Onyx in a single injection. C–F, Different stages of a 47-minute Onyx injection show progressive filling of the nidus, including the dominant draining vein (arrow in F).