Two patients had an acute third nerve palsy associated with a tortuous posterior cerebral artery originating directly from the internal carotid. Anatomical considerations and perusal of the literature emphasize that this is an important potential cause of ophthalmoplegia.
Scotti G. Internal Carotid Origin of a Tortuous Posterior Cerebral ArteryA Cause of Ophthalmoplegia. Arch Neurol. 1974;31(4):273–275. doi:10.1001/archneur.1974.00490400087011
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