Procedural notes: 5F Right CFA access. Bilateral internal and external carotid / Bilateral vertebral angiograms. Manual haemostasis.
Findings: There is a 1.8 cm AVM nidus within the precentral right frontal lobe. The dominant arterial supply is from an enlarged posterior frontal cortical branch of the anterior cerebral artery, there is additional arterial supply from distal right middle cerebral artery branches. The ACA supply is dysplastic with focal stenosis just before the nidus.
No feeding artery or circle of Willis aneurysms identified.
No external carotid arterial supply.
Venous drainage is superficial, via an enlarged superficial cortical vein to the subjacent superior sagittal sinus. There is no deep venous drainage identified.
Bilateral occipital DVA's are incidentally noted.
Conclusion: Grade 2 right posterior frontal AVM.