An aneurysm is an abnormal, weak spot on a blood vessel that causes an outward bulging or ballooning of the arterial wall. These weak spots can involve all walls of the blood vessel (fusiform aneurysm), form a sac from one wall (saccular) or separate the vessel walls (dissecting). An aneurysm can affect any vessel in the body but only those in the head can cause a serious medical condition, a hemorrhagic stroke when they rupture, which can lead to brain damage and death.Ruptured Cerebral Aneurysm Symptoms: When an aneurysm ruptures, called subarachnoid hemorrhage, people often complain of ""the worst headache of their life."" Other ruptured cerebral aneurysm symptoms include: Nausea and vomiting, Stiff neck or neck pain, Blurred vision or double vision, Pain above and behind the eye, Dilated pupils, Sensitivity to light, Loss of sensation.
Unruptured Cerebral Aneurysm Symptoms: Most aneurysms are asymptomatic, particularly ones that are small. Occasionally, large aneurysms may cause the following symptoms related to pressure on the adjacent brain or nerves: Peripheral vision deficits, Thinking or processing problems , Speech complications, Perceptual problems, Sudden changes in behavior, Loss of balance and coordination, Decreased concentration, Short-term memory difficulty Fatigue.
The International Subarachnoid Aneurysm Trial -- or ISAT -- is the only multi-center, prospective randomized trial comparing the safety and efficacy of endovascular coil treatment with neurosurgical clipping for the treatment of ruptured brain aneurysms. The study found that, in patients equally suited for both treatment options, endovascular coil treatment produces substantially better patient outcomes than surgery in terms of survival free of disability at one year.