Carotid paraclinoid aneurysms with intradural origin and intracavernous location

Five cases of a congenital berry aneurysm of the internal carotid artery with origin partially intradural and fundus mainly intracavernous are presented. Angiography does not allow a precise definition of the amount of aneurysm that is intradural, a fact of importance when planning treatment of these cases. However, the angiographic features are characteristics of the type and suggest that these aneurysms be grouped together as a separate entity.