Berry aneurysm of the posterior communicating aery causes compression of

Berry aneurysm in the vicinity of posterior communicating aery can compress the third carnial nerve and cause oculomotor nerve palsy Aneurysms of superior cerebellar aery or tip of the basilar aery can also compress the oculomotor nerve and produce its palsy Berry aneurysm on the internal carotid aery (near its termination) compresses the lateral aspect of optic chiasma and hence damages the visual information from the ipsilateral nasal visual field. Ref: Gray's 39e/p-22