Brain aneurysms are believed to be congenital in predisposition or may be associated with other medical conditions such as hypertension. The average age at presentation is usually 40-60 years old. Smoking predisposes to aneurysm formation.
More patients have no symptoms or complaints until the aneurysm ruptures.
Although CT and MR can show many aneurysms, most patients with aneurysms need a cerebral angiogram for definitive diagnosis and to determine the best treatment. Berry -the most common type. A small saccular shaped aneurysm that resembles a berry. Dissecting - a splitting of an artery wall through a small tear. The risk varies with aneurysm type, size, location, and history of previous aneurysm rupture.