aneurysm

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aneurysm

(ăn`yo͝orĭzəm), localized dilatation of a blood vessel, particularly an arteryartery,
blood vessel that conveys blood away from the heart. Except for the pulmonary artery, which carries deoxygenated blood from the heart to the lungs, arteries carry oxygenated blood from the heart to the tissues.
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, or the heartheart,
muscular organ that pumps blood to all parts of the body. The rhythmic beating of the heart is a ceaseless activity, lasting from before birth to the end of life. Anatomy and Function

The human heart is a pear-shaped structure about the size of a fist.
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. Dilatation of an artery, and therefore weakness of that portion of the arterial wall, may be rarely congenital, or it may be caused by syphilissyphilis
, contagious sexually transmitted disease caused by the spirochete Treponema pallidum (described by Fritz Schaudinn and Erich Hoffmann in 1905). Syphilis was not widely recognized until an epidemic in Europe at the end of the 15th cent.
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, hypertensionhypertension
or high blood pressure,
elevated blood pressure resulting from an increase in the amount of blood pumped by the heart or from increased resistance to the flow of blood through the small arterial blood vessels (arterioles).
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 (high blood pressure), arteriosclerosisarteriosclerosis
, general term for a condition characterized by thickening, hardening, and loss of elasticity of the walls of the blood vessels. These changes are frequently accompanied by accumulations inside the vessel walls of lipids, e.g.
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, bacterial and fungal infections, or penetrating injury as from a bullet or knife. An aneurysm may be asymptomatic or it may cause varying symptoms, depending upon its location and size and on whether the expanding mass is pressing on adjacent nerves or vital organs. The weakened arterial walls of an aneurysm are always in danger of sudden rupture, with resulting hemorrhage and death.

Aneurysms occur most commonly in the large arteries; the aortaaorta
, primary artery of the circulatory system in mammals, delivering oxygenated blood to all other arteries except those of the lungs. The human aorta, c.1 in. (2.54 cm) in diameter, originates at the left ventricle of the heart.
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, the largest vessel in the body, is the one most often affected. Ventricular aneurysms of the heart often occur after myocardial infarctionsinfarction,
blockage of blood circulation to a localized area or organ of the body resulting in tissue death. Infarctions commonly occur in the spleen, kidney, lungs, brain, and heart.
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. Aneurysms also occur in the arteries within the skull and in other areas of the body.

Aneurysms can be detected by echocardiogram, spin echo magnetic resonance imaging scans, coronary arteriograms, and biplane ventriculograms. Treatment, where feasible, may involve surgery to remove the aneurysm or the insertion of coiled wire to close it off. Coiled wire can only be used on aneurysms that are connected to the blood vessel by a narrowed neck. The coiling fills the aneurysm, obstructing the flow of blood into the dilatation, and blood clots form around the wire, preventing the aneurysm from bursting. Surgical excision of the dilated saclike portion of the affected artery sometimes requires the replacement of that portion by a synthetic graft, a section of vessel (made of polymer fiber) that is similar in size.

aneurysm

[′an·yə‚riz·əm]
(medicine)
Localized abnormal dilation of an artery due to weakening of the vessel wall.

aneurysm

, aneurism
a sac formed by abnormal dilation of the weakened wall of a blood vessel
References in periodicals archive ?
The women with brain aneurysms, who ranged in age from 31 to 80, were found to be significantly less likely to have taken oral contraceptives or HRT during their lives.
The Luna AES treats brain aneurysms by blocking (embolizing) blood flow while providing a scaffold to encourage tissue growth across an aneurysm opening and create a plug.
PULLING THROUGH: Georgie Hugill in the hospital, top, after suffering a brain aneurysm, and her stitches, above, after surgery
This acquisition directly supports our stated strategy of bringing breakthrough neurovascular therapies to our markets and adds an innovative new product platform to benefit the large number of patients suffering from brain aneurysms that currently are not well treated with either surgical or endovascular techniques," said Robert Palmisano, Ev3's president and CEO.
Since there is a genetic connection, screening for brain aneurysms is recommended for close family members if more than one aneurysm exists in a sibling group (immediate 'blood family'), or if one family member has multiple aneurysms.
There are an incredible number of people walking around with brain aneurysms, but only a small percentage of these aneurysms will rupture," said G.
Treatment of brain aneurysms using coil embolization, or endovascular coiling, involves insertion of a catheter into the femoral artery in the patient's leg and navigating it through the vascular system, into the brain and into the aneurysm.
Japanese neurosurgeons will now have an important alternative to treat brain aneurysms.
Flow diversion has been a major breakthrough therapy for large or giant wide-necked brain aneurysms that are complex and have considerably higher risk of rupture and higher rates of complication with conventional treatment," said Dr.
A few genetic conditions are linked to brain aneurysm formation.
Nussbaum, a neurosurgeon at the National Brain Aneurysm Center, offers residents, fellows, and neurosurgeons this atlas, which explains how to perform surgical procedures for intracranial aneurysms and is accompanied by two DVDs containing 57 videos for demonstration.
I've been affected myself and was in danger of having a stroke following a brain aneurysm in 2006.