Fig 2. Radiologic-surgical correlation for a left superolateral paraclinoid aneurysm (case 14). A, DSA of the left ICA (lateral view) showing an aneurysm (arrows) interpreted as transitional with an intracavernous neck and a transitional sac. B, C, PMP in the diaphragmatic plane with an intersection angle showing a supracavernous location of the neck and the sac (DL indicates diaphragmatic line; CL, clinoid line). D, Operative findings confirming the supracavernous location of both neck and sac and showing, after anterior clinoidectomy and opening of the falciform ligament, the aneurysmal (arrowhead) relationship between the ICA and the optic nerve (ON).