FIG 6. Patient 19, aneurysm 33. Example of ability of 2D and 3D helical CTA to visualize intracavernous carotid aneurysms.

A, Axial view 2D multiplanar reformatted image, obtained at the level of the sella turcica, shows a 2.7-mm saccular aneurysm of the left carotico-ophthalmic region (arrow).

B, Sagittal view 2D multiplanar reformatted image shows an inferiorly projecting saccular aneurysm (arrow).

C, Volume-rendered mediolateral projection helical CTA image shows a small inferiorly projecting aneurysm sac (arrow).

D, Arterial phase lateral projection DSA image shows the small inferiorly projecting aneurysm sac shown in A–C (arrow).