A 37 year-old man presented with a severe headaches and vomiting.

Right Internal Carotid Angiogram: (Left) lateral view; (Right) Oblique view. The angiogram demonstrates an aneurysm on arising from the carotid artery near the origin of the ophthalmic artery. Most aneurysms are thought to be congenital or development. They usually occur at major arterial bifurcations. Usually, they are symptomatic until either they bleed or enlarge and create a mass effect on nearby structures.