Most common site of cerebral aneurysm is:

Prevalence of Cerebral Aneurysm by Location: Anterior circulation 85% 30% Anterior communicating aery 25% Posterior communicating aery 20% Middle cerebral aery bifurcation 10% Other Posterior circulation 15% 10% Basilar aery, most frequently at the basilar tip 5% Veebral aery, usually at the posterior inferior cerebellar aery Ref: Schwaz's principle of surgery 9th edition, chapter 42.