An aneurysm is an excessive localized enlargement of an artery caused by weakness in the arterial wall. Aneurysms may remain silent or rupture, causing serious problems and even death.
An aneurysm can occur in important arteries such as those supplying blood to the brain, and the aorta; the large artery that originates at the left ventricle of the heart and passes down through the chest and abdominal cavities.
Hemorrhagic stroke is caused by arteries in the brain either leaking blood or bursting open. The leaked blood puts pressure on brain cells and damages them. Blood vessels can burst or spill blood in the middle of the brain or near the surface of the brain, sending blood into the space between the brain and the skull.
According to www.stroke.org, Hemorrhagic Strokes account for about 15% of all strokes, but they are responsible for about 40% of all stroke deaths.