On the left side there is no clear demonstration of the left internal carotid. The common carotid is visualized arising from the arch and continues in and unobstructed fashion as the external carotid artery. The doppler signals within the vessel are of high resistance way form throughout indicating no significant connection to the low resistance internal carotid system. This raises the possibility that the patient has a significant vascular anomaly as congenital absence if the internal carotid artery.
Both vertebral arteries are patent. Abnormally low bifurcation of the right common carotid.