That in which both' a right carotid artery and a left are present.
Each brachiocephalic soon sends off its subclavian, while in the normal or more usual cases the rest proceeds as the carotid trunk, inclusive of the vertebral artery.
A carotid angiogram is an Xray of the circulation to the brain taken by injecting dye (contrast) into the carotid artery.
It is non-invasive and has replaced arteriography as the investigation of choice in the assessment of carotid artery disease and in post-operative graft surveillance.
The common carotid is on the right and the internal carotid is on the top.