Case #1a
Lateral aortic arch injection
The ascending and deep cervical arteries on the right reconstitute the occluded right vertebral artery. Occlusion of the right common carotid and marked stenosis of the left internal carotid are also demonstrated.
Case #1b
RPO neck, aortic arch injection
This projection better demonstrates the left internal carotid stenosis and the enlarged deep cervical artery which reconstitutes the vertebral artery.
Case #1c
AP cranial view, aortic arch injection
Blood supply to the brain is primarily from the critically stenotic left internal carotid and collateral circulation.