Abstract

• Giant aneurysm occures rarely and it is about 5% of intracranial aneurysm. Giant aneurysm arising from the intradural portion of the internal carotid artery proximal to the origin of the posterior communicating artery present specialsurgical problem. Most of these aneurysms arise in the relation to the origin of the ophthalmic artery from the anteromedial aspect of internal carotid artery; however, others arise from the posterolateral portion of the internal carotid artery. In some of the largest ones, the neck is so wide that the site of origin is not clear. As a group, these aneurysms can be called paraclinoid. In these cases, operative difficulty is presented and complication is well developed, so treatment is marked difficult. We experience a case of giant paraclinoid ane-urysm which was treated by common carotid artery ligation in the neck and report with brief review of the literature.