On the symmetry and asymmetry of the bifurcation of the common carotid artery: a study of bilateral carotid angiograms in 100 adults.

Bilateral carotid angiograms of the neck in 100 consecutive adult patients show the bifurcation of the left common carotid artery to be located cranial to the right in 50% of the cases, while the right bifurcation was higher in 22%. The origin of the internal carotid artery was at the dorsal or dorsolateral aspect of the common carotid artery in 82% on the right side and in 94% on the left, while a dorsomedial or medial origin was found in 18% on the right side and in 6% on the left.