Dolicoectasia with Basilar Aneurysm

NonContrast CT study of brain and Non contrast 3D TOF MR Brain Angiography show:
Left vertebro basilar Dolico Ectasia.
Basilar mid portion shows a saccular aneurysm with hyperdense thrombus in it.
High riding basilar tip and PCAs.
Dilated both the ICAs cavernous and supra clinoid portion with high riding bifurcation of ICA.