Aneurysm Arising from the Junction of Internal Carotid Artery and Duplicated Middle Cerebral Artery

A case of an aneurysm arising from the junction of the internal carotid artery and duplicated middle cerebral artery was reported. A 77-year-old female was admitted to our hospital with complaints of headache, nausea, vomiting and disturbance of consciousness. CT scan showed a high-density area in the basal cistern and Sylvian fissure. Carotid angiography revealed saccular aneurysm arising from the junction of the right internal carotid artery and duplicated middle cerebral artery orginating from the internal carotid artery. The neck of aneurysm was clipped via the basal interhemispheric approach on the day of onset. Transient right oculomotor nerve palsy occurred in the postperative course. Normal pressure hydrocephalus was treated by ventriculoperitoneal shunt. The relationship between the genesis of aneurysms and the duplicated middle cerebral artery was discussed. From the location of these aneurysms associated with the duplicated middle cerebral artery, we suggested that congenital etiological factors were modified by the acquired hemodynamic factors.

Duplicated middle cerebral artery

Cerebral aneurysm