Figure 4.

A,B) CTA and DSA showing an irregularly shaped basilar tip wide-necked aneurysm, oriented anteriorly and laterally to the right. The posterior cerebral arteries and superior cerebellar arteries originate in proximity of the aneurysm neck. C) After WEB II deployment, a marked decrease of intra-aneurysmal blood flow can be observed. The patency of both posterior cerebral arteries and superior cerebellar arteries is maintained. D) DSA performed 8 months after treatment shows a small residual neck in the basilar tip aneurysm as well as preserved patency of all the blood vessels originating in proximity of the aneurysm neck.