Fig 5.

Case 12, a 70-year-old-woman with a basilar artery top aneurysm resulting in rupture.

A, 3D CT angiogram (CTA), posteroanterior projection, shows the aneurysm and cranial base bone.

B, 3D MR cisternogram (MRC), posteroanterior projection viewed from the interpeduncular cistern, shows the spatial relationship of the aneurysm with dome blebs, parent arteries, and caudal aspect of the diencephalon and the third ventricle. DE indicates diencephalon; IIIrd V, the third ventricle; CP, cerebral peduncle; LtP1, first segment of the left posterior cerebral artery; RtP1, first segment of the right posterior cerebral artery; LtSCA, left superior cerebellar artery; RtSCA, right superior cerebellar artery; BA, basilar artery. Arrowhead indicates the bleb.

C, 3D MR angiogram (MRA), coordinated projection as to the 3D MRC in B, shows the arterial components of the aneurysmal complex.

D, Fusion image of the 3D MRC and MRA shows the contact of the dome bleb with the floor of the adjacent third ventricle (diencephalon).