Aneurysm (redirected from venous aneurysm)

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

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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.

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an·eu·rysm or an·eu·rism (ny-rzm) n. A localized, blood-filled dilation of a blood vessel caused by disease or weakening of the vessel wall. aneu·rysmal (-ml), aneu·ris·matic (-mtk) adj.

aneurysm abdominal aortic aneurysm

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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

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aneurysm (an·y·riˑ·zm),

n bulging area of a blood vessel wall caused by weakness, or thinning in the wall's structure.

Aneurysm.

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aneurysm (an´yōōrizm),

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.

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aneurysm

a sac formed by the localized dilatation of the wall of an artery, vein or the heart.

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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.