Fig 4.

Quantification of arterial inflow to AVM nidus. A is an axial section from a time-of-flight MRA demonstrating the left frontoparietal nidus. B has singled out the 3 largest arteries supplying the nidus: vessel 1 is an anomalous branch of the anterior cerebral artery running along the septum pellucidum, and vessels 2 and 3 are posterior left middle cerebral artery branches. C shows the marked increase in blood flow through the left internal carotid artery in the patient compared with a healthy subject (3.3 times greater), as well as the relative arterial contribution to the AVM nidus of the blood vessels labeled on the MRA.