| Abstract: | A case of agenesis of left internal carotid artery is reported. The patient is a forty one-year-old house-wife with sudden episode of headache when she had a fever. CT scan of the head showed a small high density area in the right frontotemporal subcortical region. Four vessel cerebral angiography demonstrated negative lesion except for complete absence of the left internal carotid artery. The blood supply to the left cerebral hemisphere was provided both through the tortuous anterior communicating artery and through the enlarged left posterior communicating artery. Left ophthalmic artery arose from the left posterior communicating artery. The embryological developmental process of this kind of vascular anomaly as well as the relationship between intravascular hemodynamic stress and the induction of cerebral aneurysm were discussed in detail. |
