FIG 2. Case 1: A 74-year-old man with an unruptured right internal carotid-posterior communicating artery aneurysm.

A, Conventional parallel volume-rendered 3D MR angiogram, viewed from above.

B, Conventional parallel volume-rendered 3D CT angiogram, viewed from above.

C, Arteriogram, similar projection to the operative view in D.

D, Operative photograph before aneurysmal neck clipping shows the neck and dome of the aneurysm. A yellowish-colored atherosclerotic lesion of the wall is observed on the internal carotid artery and base of the aneurysmal neck.

E, Conventional perspective volume-rendered 3D MR angiogram shows the aneurysmal dome, internal carotid artery, and branching posterior communicating artery.

F, Transluminal 3D MR angiogram of the same projection shows the orifice of the posterior communicating artery at the neck.

G, Conventional 3D CT angiogram shows similar aneurysmal architecture, with the surrounding veins and bony structures.

H, Transluminal 3D CT angiogram shows the transparent view of the aneurysmal architecture, with calcified nodules at the neck enhanced in red.