Malformation of bilateral carotid artery with congenital blocking of left common carotid artery and right external carotid artery pseudoaneurysm on its original site is seldom seen.

• 双侧颈总动脉发育异常、左侧颈总动脉先天性闭锁、右侧颈外动脉在颈内外分杈处形成假性动脉瘤临床罕见。