Right internal carotid artery agenesis.

Congenital absence of one or both carotid arteries is a rare anomaly. It is usually discovered incidentally by computed tomography, or magnetic resonance imaging of head and neck taken for some other reason. Most of the patients are asymptomatic, although there is a close association of intracranial aneurysms and subarachinoid hemorrhage in many patients. Here we report a case of right internal carotid agenesis in a young female associated with recent onset amnestic syndrome.