Blister aneurysms are located on the nonbifurcated parts of the arteries. They are rarely seen and their diagnosis and treatment are quite difficult. They have large basement, blister type appearance and semi-spheric shapes on angiography. The treatment of these aneurysms is risky and also have high morbidity and mortality rates. In this article a patient with a blister aneurysm who had been treated in our clinic is presented. Colleagues are warned about the possible complications of blister aneurysms in the light of the current literature.

Keywords: Blister aneurysms, internal carotid artery, surgical treatment