Anterior choroidal artery territory infarction.

The anterior choroidal artery (AChA) originates from the posterior wall of the internal carotid distal to the posterior communicating artery and proximal to the intracerebral carotid bifurcation. This thin artery is rarely the cause of aneurysm and only accounts for 2-5% of all aneurysms. Even though the AChA territory shows large variations among individuals, it supplies crucial motor and sensory structures, such as the internal capsule, optic tract, the posterior limb of the internal capsule, the cerebral peduncle, and the choroid plexus.