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The most common site for an arterial aneurysm is the abdominal aorta. A true aneurysm results from formation of a sac by the arterial wall with at least one unbroken layer. It is most often associated with atherosclerosis. A false aneurysm usually is caused by trauma. In this case, the wall of the blood vessel is ruptured and blood escapes into surrounding tissues and forms a clot. Because of pressure within the clot arising from the heart's contractions, the clot often pulsates against the examiner's hand as does a true aneurysm.
Although atherosclerosis is responsible for most arterial aneurysms, any injury to the middle or muscular layer of the arterial wall (tunica media) can predispose the vessel to stretching of the inner and outer layers of the artery and the formation of a sac. Other diseases that can lead to an aneurysm include syphilis, cystic medionecrosis, certain nonspecific inflammations, and congenital defects in the artery.
It is possible for a person to be unaware of a small aneurysm for years. About 80 per cent of all abdominal aneurysms are palpable and may be noticed on a routine physical examination. One should be particularly alert to the possibility of an aneurysm in persons with a history of cardiovascular disease, hypertension, or peripheral vascular disease.
Aneurysms tend to increase in size, presenting a problem of increasing pressure against adjacent tissues and organs and a danger of rupture. When an aneurysm ruptures, a critical situation ensues. The patient with a ruptured aortic aneurysm exhibits severe pain and blood loss, leading to shock. A ruptured cerebral aneurysm produces neurologic symptoms and can resemble the clinical picture of stroke syndrome.
Treatment of aneurysm depends on the vessel involved, size of the aneurysm, and general health status of the patient.
cerebral aneurysmA dilated and weak segment of a cerebral artery, often located in the circle of Willis at the base of the brain, which is susceptible to rupture; cerebral aneurysms may be birth defects or follow poorly controlled hypertension.
“Thunderclap headache” often associated with nausea, vomiting and reduced consciousness.
brain aneurysmCerebral aneurysm Neurology A dilated and weak segment of a cerebral artery, often located in the circle of Willis at the base of the brain, which is susceptible to rupture; BAs may be caused by birth defects or follow poorly controlled HTN Clinical “Thunderclap headache” often associated with N&V, ↓ consciousness
Patient discussion about brain aneurysm
Q. Could I be going through a Brain aneurysm? i woke up in the night with a bad headache in the back of my head and above my eye. never had a headache like that. but all day today have not had the headache. could this be an aneurysm?
Q. Can I have a MRI of the knee if I have hemostatic clips in the brain?(also called aneurysm clips)?