To the Editor.—A complete absence of branches has always been a reliable feature of the cervical portion of the internal carotid artery.1 We have encountered an exception to this rule where the internal carotid artery bifurcated in the neck.
Report of a Case.—A 71-year-old man, suffering from transient episodes of numbness of the left arm, disturbances of vision involving his left eye, numbness ofthe right thumb and forefinger, and dizziness, was subjected to angiography. Severe bilateral stenoses of the internal carotid artery and severe stenosis of the left external carotid artery were demonstrated. The left internal carotid artery bifurcated approximately 4 cm from the skull, forming two vessels of equal size (Figure). The more anterior vessel continued cephalad as the internal carotid artery while the posterior vessel supplied the vertebrobasilar circulation.
One month after an uneventful endarterectomy on the right side of the neck, operation was performed