Most common site for berry aneurysm rupture?: (A) Anterior circulation of brain, (B) Posterior circulation of brain, (C) Ascending aoa, (D) Desending aoa
Answer is B. Harrison's principles of internal medicine 17th edition. * Approximately 85% aneurysms occur in anterior circulation mostly on circle of Willis. Those >7 mm in diameter and those at the top of basilar aery and at the origin of posterior communicating aery are at greater risk of rupture