The anterior choroidal artery comes off of the communicating segment (C7) of the internal carotid artery (ICA). This is an uncommon site for isolated occlusion, but a lesion here may cause contralateral hemiplegia due to its supply to the posterior limb of the internal capsule. However, the internal capsule receives a redundant supply from the lenticulostriate arteries of the middle cerebral arteries as well.