aneurysm /an·eu·rysm/ (an´u-rizm) a sac formed by localized dilatation of the wall of an artery, a vein, or the heart.aneurys´mal
Aneurysm
aneurysm
aneurysm [an´u-rizm]
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.
aortic aneurysm aneurysm of the aorta.
arteriosclerotic aneurysm an aneurysm arising in a large artery, usually the abdominal aorta, as a result of weakening of the wall in severe atherosclerosis.
arteriovenous aneurysm abnormal communication between an artery and a vein in which the blood flows directly into a neighboring vein or is carried into the vein by a connecting sac.
atherosclerotic aneurysm arteriosclerotic a.
berry aneurysm a small saccular aneurysm of a cerebral artery, usually at the junction of vessels in the circle of Willis, having a narrow opening into the artery.
compound aneurysm one in which some of the layers of the wall of the vessel are ruptured and some merely dilated.
dissecting aneurysm one resulting from hemorrhage that causes longitudinal splitting of the arterial wall, producing a tear in the intima and establishing communication with the lumen; it usually affects the aorta (aortic dissection).
false aneurysm
1. one in which the entire wall is injured and the blood is retained in the surrounding tissues; a sac communicating with the artery (or heart) is eventually formed.
2. pseudoaneurysm.
infected aneurysm one produced by growth of microorganisms (bacteria or fungi) in the vessel wall, or infection arising within a preexisting arteriosclerotic aneurysm.
mycotic aneurysm an infected aneurysm caused by fungi.
racemose aneurysm dilatation and tortuous lengthening of the blood vessels.
saccular aneurysm , sacculated aneurysm a distended sac affecting only part of the arterial circumference.
varicose aneurysm one in which an intervening sac connects the artery with contiguous veins.
an·eu·rysm or an·eu·rism ( n y -r z m)n. A localized, blood-filled dilation of a blood vessel caused by disease or weakening of the vessel wall. an eu·rysmal (-ml), aneu·ris·matic (-mtk) adj. |   abdominal aortic aneurysm |
Aneurysm
A weak point in a blood vessel where the pressure of the blood causes the vessel wall to bulge outwards. An aneurysm may also appear as a sac-like projection from the blood vessel wall.
Mentioned in: Aneurysmectomy, Arteriovenous Malformations, Barbiturate-Induced Coma, Cardiac Blood Pool Scan, Cardiac Catheterization, Computed Tomography Scans, Hemoptysis, Kawasaki Syndrome, Lithotripsy, Stroke, Subarachnoid Hemorrhage, Vasculitis
aneurysm
[an′yoo͡riz′əm]
Etymology: Gk, aneurysma, widening
a localized dilation of the wall of a blood vessel. It may be caused by atherosclerosis and hypertension, or less frequently, by trauma, infection, or a congenital weakness in the vessel wall. Aneurysms are common in the aorta but also occur in peripheral vessels, especially in the popliteal arteries of older people. A sign of a large arterial aneurysm is a pulsating swelling that produces a blowing murmur on auscultation. Small aneurysms may produce no sound at all. An aneurysm may rupture, causing hemorrhage, or thrombi may form in the dilation and give rise to emboli that may obstruct smaller vessels. Aneurysms are usually named by the area in which they occur. Kinds of aneurysms include aortic, bacterial, berry, cerebral, compound, dissecting, fusiform, mycotic, racemose, Rasmussen's, saccular, varicose, and ventricular aneurysm. Also called vascular tumor. See also pseudoaneurysm. aneurysmal, adj.
aneurysm [an´u-rizm]
a sac formed by the localized dilatation of the wall of an artery, a vein, or the heart.
adj., adj aneurys´mal. The chief signs of an arterial aneurysm are the formation of a pulsating tumor, and often a bruit (aneurysmal bruit) heard over the swelling. Sometimes there are symptoms from pressure on contiguous parts. Classification of aneurysms. All three tunica layers are involved in true aneurysms (fusiform and saccular). In false aneurysms, blood escapes between tunica layers and they separate. If the separation continues, a clot may form, resulting in a dissecting aneurysm. From Copstead and Banasik, 2000.
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.
arteriosclerotic aneurysm an aneurysm arising in a large artery, most commonly the abdominal aorta, as a result of weakening of the wall in severe atherosclerosis; called also atherosclerotic aneurysm.
arteriovenous aneurysm an abnormal communication between an artery and a vein in which the blood flows directly into a neighboring vein or is carried into the vein by a connecting sac.
atherosclerotic aneurysm arteriosclerotic aneurysm.
bacterial aneurysm an infected aneurysm caused by bacteria.
berry aneurysm (brain aneurysm) a small saccular aneurysm of a cerebral artery, usually at the junction of vessels in the circle of Willis; such aneurysms frequently rupture, causing subarachnoid hemorrhage. Called also cerebral aneurysm.
cardiac aneurysm thinning and dilatation of a portion of the wall of the left ventricle, usually a consequence of myocardial infarction.
cerebral aneurysm berry aneurysm.
cirsoid aneurysm dilatation and tortuous lengthening of part of an artery; called also racemose aneurysm.
compound aneurysm one in which some of the layers of the wall of the vessel are ruptured and some merely dilated; called also mixed aneurysm.
dissecting aneurysm one resulting from hemorrhage that causes lengthwise splitting of the arterial wall, producing a tear in the inner wall (intima) and establishing communication with the lumen of the vessel. It usually affects the thoracic aorta (see aortic dissection) but can also occur in other large arteries. See illustration.
false aneurysm
one in which the entire wall is injured and the blood is contained by the surrounding tissues, with eventual formation of a sac communicating with the artery (or heart). See illustration.
fusiform aneurysm a spindle-shaped aneurysm; see illustration.
infected aneurysm one produced by growth of microorganisms (bacteria or fungi) in the vessel wall, or infection arising within a preexisting arteriosclerotic aneurysm.
mixed aneurysm compound aneurysm.
mycotic aneurysm an infected aneurysm caused by fungi.
racemose aneurysm cirsoid aneurysm.
saccular aneurysm (sacculated aneurysm) a saclike aneurysm; see illustration.
spurious aneurysm
false aneurysm (def. 1).
varicose aneurysm one formed by rupture of an aneurysm into a vein.
aneurysm (an·y
·riˑ·zm),n bulging area of a blood vessel wall caused by weakness, or thinning in the wall's structure.
)
Aneurysm.
aneurysm (an´yōōriz
m),n a localized dilation of an artery in which one or more layers of the vessel walls are distended.
aneurysm, arteriovenous,
n See shunt, arteriovenous.
aneurysm
a sac formed by the localized dilatation of the wall of an artery, vein or the heart.
aortic aneurysm
see aortic aneurysm.
arteriovenous aneurysm
an abnormal communication between an artery and a vein in which the blood flows directly into a neighboring vein or is carried into the vein by a connecting sac.
atherosclerotic aneurysm
one arising as a result of weakening of the tunica media in severe atherosclerosis.
bacterial aneurysm
an infected aneurysm caused by bacteria.
berry aneurysm
a small saccular aneurysm of a cerebral artery, usually at the junction of vessels in the circle of Willis; such aneurysms frequently rupture, causing subarachnoid hemorrhage. Called also brain aneurysm.
cardiac aneurysm
thinning and dilatation of a portion of the wall of the left ventricle, usually a consequence of myocardial infarction.
cirsoid aneurysm
dilatation and tortuous lengthening of part of an artery.
compound aneurysm
one in which some of the layers of the wall of the vessel are ruptured and some merely dilated. Called also mixed aneurysm.
congenital aneurysm
observed sporadically in the aorta and pulmonary artery.
dissecting aneurysm
one resulting from hemorrhage that causes lengthwise splitting of the arterial wall, producing a tear in the inner wall (intima) and establishing communication with the lumen of the vessel; it usually affects the thoracic aorta. Seen most commonly in horses and caused by larvae of Strongylus vulgaris. See strongylosis. A specific disease of turkeys.
fusiform aneurysm
a spindle-shaped aneurysm.
infected aneurysm
one produced by growth of microorganisms (bacteria or fungi) in the vessel wall, or infection arising within a pre-existing arteriosclerotic aneurysm.
inherited aortic aneurysm
causes a high mortality rate in the affected cattle breed. The defect is in the abdominal aorta.
lung aneurysm
may result from the lodgement of pulmonary emboli; rupture and pulmonary hemorrhage are potential sequelae.
mixed aneurysm
compound aneurysm.
mycotic aneurysm
an infected aneurysm caused by fungi.
pseudoaneurysm
false aneurysm.
racemose aneurysm
cirsoid aneurysm.
sacculated aneurysm
a saclike aneurysm.
varicose aneurysm
one formed by rupture of an aneurysm into a vein. See also aneurysmal varix.
venous aneurysm
see venous dilatation.
verminous aneurysm
see strongylosis.
aneurysm
A localized dilatation of the walls of a blood vessel, usually an artery, as a result of infection, injury or degeneration. It is filled with fluid or clotted blood. Aneurysms occur in diabetic retinopathy, and retinal veinocclusion leading to haemorrhages and oedema.
aneurysm
Surgery A weakened or attentuated site on the wall of an artery, a vein or the ventricle, which has stretched or ballooned and filled with blood or, in an artery, resulting in a splitting of the wall, leading to pooling of blood in
the vessel wall Clinical Pulsating mass, bruit–aneurysmal bruit over the swelling, ± symptoms from pressure on contiguous parts. See Abdominal aortic aneurysm, Aortic aneurysm, Berry aneurysm, Cerebral aneurysm, Mycotic aneurysm, Ruptured aortic aneurysm.
Patient discussion about 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?
A. An Aneurysm is when a blood vessel just pops out in you’re brain. Very ironically, there are no sensory nerves inside the brain and the headache that comes with aneurysm is when the brain starts pressuring the material that surrounds it. That means this will be a later symptoms and you’ll probably have a paralyses before, or have problem speaking and things like that. If you are not convinced – you can go to the hospital and ask for a scan.
Q. Is there a good screening test for aortic abdominal aneurysm? A friend of mine was diagnosed with an aortic abdominal aneurysm. I am afraid i might have this condition too. is there any screening test that is good for me?
A. The answer to your question depends on your age your sex and your history of smoking. 3 years ago when my husband was diagnosed with an aortic abdominal aneurysm our GP said that the screening is good only for males age 65-75 that smoke.
Go to your GP and ask him even if you are not in those criteria, maybe the rules have changed.
Go to your GP and ask him even if you are not in those criteria, maybe the rules have changed.
Q. What are the causes of aneurysm?
A. An aneurysm can result from atherosclerosis (hardening and narrowing of the inside of arteries). As atherosclerosis develops, the artery walls become thick and damaged and lose their normal inner lining. This damaged area of artery can stretch or "balloon" from the pressure of blood flow inside the artery, resulting in an aneurysm.
An aneurysm also can develop from constant high blood pressure inside an artery.
A thoracic aortic aneurysm can result from an injury to the chest (for example, an injury that occurs from an auto crash). Certain medical conditions, such as Marfan syndrome, that weaken the body's connective tissues, also can cause aneurysms. http://www.nhlbi.nih.gov/health/dci/Diseases/arm/arm_causes.html
These may be of use also:
http://www.health.uab.edu/14537/
http://www.lancastergeneral.org/content/greystone_36293.htm
Hope this helps.
Read more or ask a question about aneurysmAn aneurysm also can develop from constant high blood pressure inside an artery.
A thoracic aortic aneurysm can result from an injury to the chest (for example, an injury that occurs from an auto crash). Certain medical conditions, such as Marfan syndrome, that weaken the body's connective tissues, also can cause aneurysms. http://www.nhlbi.nih.gov/health/dci/Diseases/arm/arm_causes.html
These may be of use also:
http://www.health.uab.edu/14537/
http://www.lancastergeneral.org/content/greystone_36293.htm
Hope this helps.
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