A brain aneurysm is a weak, bulging area in an arteryA thick-walled blood vessel carrying blood flow from the heart to any organ of the body, including the brain. in the brain, analogous to a thin balloon or a weak spot on a tire’s inner tube. Because its walls may be weak and thin, an aneurysm is at risk of rupturing. If an aneurysm ruptures, blood spills into the space between the skull and the brain, a serious type of strokeA disability caused by injury to the brain. Most strokes are caused by loss of blood flow to a portion of the brain (called an ischemic stroke or cerebral infarction) or by injury related to bleeding within the brain tissue (an intracerebral hemorrhage) or into the space around the brain (subarachnoid hemorrhage). known as a subarachnoid hemorrhage (SAH)Bleeding into the space around the brain (the subarachnoid space)..
Types of brain aneurysms
Saccular aneurysms, also called “berry” aneurysms because they look like berries, are the most common type of brain aneurysm. Saccular aneurysms have a “neck” that connects the aneurysm to its main (“parent”) artery and a larger, rounded area called the dome. These aneurysms bulge on only one side of the artery wall. A less common type is a fusiform aneurysmAn irregular shaped widening of a cerebral vessel that does not have a discrete neck or pouch., in which the artery is widened on both sides. Fusiform aneurysms do not have a defined neck.
“Brain Aneurysm Basics.” Brain Aneurysm Foundation, bafound.org/about-brain-aneurysms/brain-aneurysm-basics/.
But if it does blow up, the chances of surviving are only one in two, and the odds of surviving without severe brain damage are only one in four.
The largest international study to date showed that unruptured aneurysms smaller than 10 mm — about the size of a raisin — had a tiny risk of rupture, provided the patient had no earlier history of bleeding from a brain aneurysm, and higher risks associated with surgical treatment.
Almost half of patients die within 30 days of aneurysm rupture, and about half of the survivors have irreversible brain damage. “So if your brain aneurysm ruptures, you have only a one in four chance of doing well,” Bederson says.
Barclay, Laurie. “Brain Aneurysms: To Operate or Not to Operate?” WebMD, WebMD, 30 Oct. 2000, http://www.webmd.com/brain/news/20001030/brain-aneurysms-to-operate-not-to-operate#3.
Only about 30,000 of people in the United States experience ruptured aneurysms each year. Forty percent of ruptured aneurysms are fatal.
Pressure from the blood leaking into your brain from a ruptured aneurysm can build up quickly. If the pressure becomes too high, you can lose consciousness. Death can occur in some cases.
After a brain aneurysm ruptures, it can rupture again at any time, even after treatment. Your brain’s blood vessels can also become narrow without warning (vasospasms) in response to elevated pressure around the brain.
Other complications include:
- hydrocephalus, in which cerebrospinal fluid circulation is impaired
- hyponatremia, or low sodium levels due to the brain injury
COULDNT SOURCE!!! Brindles Lee Macon, Tim Jewell and Matthew Solan. “Brain Aneurysm.” Healthline, 2016, Brindles Lee Macon, Tim Jewell and Matthew Solan.
A stroke is a sudden interruption in the blood supply of the brain. Most strokes are caused by an abrupt blockage of arteries leading to the brain (ischemic stroke). Other strokes are caused by bleeding into brain tissue when a blood vessel bursts (hemorrhagic stroke). Because stroke occurs rapidly and requires immediate treatment, stroke is also called a brain attack. When the symptoms of a stroke last only a short time (less than an hour), this is called a transient ischemic attack (TIA) or mini-stroke.
“The Internet Stroke Center.” The Internet Stroke Center. An Independent Web Resource for Information about Stroke Care and Research., http://www.strokecenter.org/patients/about-stroke/what-is-a-stroke/.