Anterior Choroidal Artery Aneurysm
Last Updated: September 28, 2018
Aneurysms of the posterior wall of the internal carotid artery (ICA,) namely the anterior choroidal artery (AChA) and posterior communicating artery (PCoA) aneurysms, represent the most common site for intracranial aneurysms (up to 35% of total aneurysms.)
The AChA arises a few millimeters distal and slightly lateral to the origin of the PCoA from the supraclinoid ICA. It has a slightly smaller caliber, can immediately branch after its origin, and supplies very important territories, such as the posterior limb of the internal capsule, basal ganglia, optic apparatus, cerebral peduncle, lateral geniculate body, and limbic system.
There is minimal collateral support for this vessel, and its preservation is of paramount importance d...