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 ?
We report a rare case of CAF with a giant saccular aneurysm misdiagnosed as a mediastinal mass due to its huge size.
Congenital torticollis and saccular dysfunction: a case report.
The function of the horizontal semicircular canal (CSH) was studied by means of response to caloric and rotatory stimulus, and the saccular function was examined using Vestibular Evoked Myogenic Potential (VEMP) in children with CI.
At the border of viability between 22 and 24 weeks of gestation, saccular stage of lung development starts which is a very critical and vulnerable period of lung development.
In this research work, an aorta having a saccular aneurysm is reconstructed from a CT image.
(b) A diagnostic cerebral angiogram less than 3 weeks from previous imaging demonstrating interval development of a saccular aneurysm at the callosomarginal and pericallosal bifurcation.
We diagnosed this patient as having an infected suprarenal aortic aneurysm, due to CTA findings showing saccular aneurysm and periaortic inflammation in the visceral segment of the aorta, even though her hemoculture was negative.
In the pathologic findings of our case, the fetal intra-abdominal cyst was found to be comprised of small intestinal epithelium in the anterior region and bladder epithelium in the posterior region and turned out to be a saccular cloaca.
ICA agenesis is often incidental, however it is of important note that ruptured and unruptured intracranial saccular aneurysms are found at much higher rates in these patients compared to the general population, particularly after the age of 30 (67 percent in one series (2); although most sources cite estimates closer to 25-43 percent).
They measure saccular function representing inhibitory responses conducted through the inferior vestibular nerve to the accessory nucleus in the brainstem and via accessory nerves to the ipsilateral sternocleidomastoid muscle (19).
Contrast enhanced CT scan of chest and later CTA was performed which showed a saccular aneurysm arising from mediastinal part of left common aortic artery surrounded by thrombosis with a cylindrical linear metallic foreign body.