전대뇌동맥이 내경동맥으로부터 낮게 분지하며 시신경 밑으로 주행하는 것은 매우 드문 기형으로 현재까지 세계적으로 약 33예가 보고되었으며, 동맥류가 잘 동반되는 것으로 알려져 있다. 저자들은 파열된 중대뇌동맥류와 함께 동반된 전대뇌동맥의 시신경하 주행 1예를 혈관조영술 및 자기공명영상 소견과 함께 보고하고자 한다.
An infraoptic anterior cerebral artery (ACA) arising at a low bifurcation of the internal carotid artery is a rare anomaly, of which about 33 cases have been reported to date, often in association with cerebral aneurysms. We describe a case involving an infraoptic ACA in which a ruptured middle cerebral artery aneurysm was also present. Angiography revealed the presence of an abnormal solitary ACA, arising from the intracranial proximal internal carotid artery near the origin of the ophthalmic artery, and a contralateral middle cerebral artery aneurysm. Magnetic resonance imaging showed that the ACA passed below the ipsilateral optic nerve, anterior to the optic chiasm, to join the normally positioned anterior communicating artery above the optic chiasm.
