What is an aneurysm and what are its risks? An aneurysm is an abnormal localized enlargement of an artery in the brain. In layman’s terms, the wall of the artery is like the inner tube of a bicycle, and the aneurysm is formed by a bulge in the worn-out area. What is aneurysm embolization? Aneurysm embolization is a minimally invasive method of treatment using neurointerventional technology, which does not require craniotomy, but only requires an arterial puncture at the root of the thigh to insert a microcatheter into the aneurysm and occlude the aneurysm with materials such as spring coils, stents, and medical adhesive to prevent bleeding from the aneurysm and achieve healing. Some medically advanced European and American countries have adopted endovascular neurointervention as the preferred method for treating aneurysms.