MRA of the Aortic Arch with Contrast Bolus. This study is complementary to the standard neck and intracranial MRA. It allows visualization of the common carotids, and especially the origin of the ...

The blood pressure was 85/75 mm. of mercury in the left arm and 120/80 mm. of mercury in the right. There was a localized Grade 2 systolic bruit over the left subclavian artery.

The right subclavian artery is occluded at its origin (a). The distal portion of the right vertebral artery is filling retrogradely. The proximal left subclavian artery is partially obstructed at ...

Site of origins. The ASA originated from the vertebral artery as a paired right and left rami in all but one specimen in which only the left ASA was present.

Vertebral Basilar Angiogram. (Left) lateral view; (Right) AP view. This study was performed by injecting contrast into the right vertebra artery, which is well opacified. There is also some retrograde ...

A microcatheter was advanced over a microwire through the right VA into the left VA (Figure 4). Digital subtraction angiography (DSA) showed collaterals from the cervical left VA into the LSA ...

During head rotation, neck hyperextension and other provocative manoeuvres of the neck, the vertebral artery may be compressed at various sites along its course.1 A 63-year-old man with a history of ...