A 56 year old man comes with history of right sided weakness & left sided visual loss. Where is the occlusion?

The key is D. Carotid artery. [Carotid artery divides to internal and external carotid of which internal

continues as middle cerebral ultimately. But just before it becomes middle cerebral internal carotid

gives rise to ophthalmic branch. So middle cerebral occlusion may give partial visual loss but not

complete mono-ocular blindness. For complete mono-ocular blindness occlusion should be proximal to

ophthalmic artery i.e. either in internal carotid or more proximally to carotid artery].