An aneurysm is a weakened part of a vein or an artery which stretches out and bulges out like a small balloon. A brain aneurysm may not pose any risk but if it bleeds or bursts it may pose serious risks. The doctor may recommend an imaging test to determine the location and size of the aneurysm. A brain aneurysm surgery could involve surgical clipping or endovascular coiling. A piece of the skull is removed and a metal clip may be used to stop the leak in the former. Alternatively, a catheter is inserted from an artery in the groin area and it is guided to the brain where a coil is placed within the artery to seal the leak and stop the blood flow.