Figure 1:

Cerebral angiography showing a wide-necked aneurysm measuring 8.1 mm × 6.1 mm; neck, 5.7 mm, at the BA tip. (a and b) The aneurysm is strongly tilted to the right and posterior relative to the BA, and the bilateral PCA and SCA diverge from the aneurysm body. BA: Basilar artery, PCA: Posterior cerebral artery, and SCA: Superior cerebellar artery.