bacterial aneurysm

bacterial aneurysm,

a localized dilation in the wall of a blood vessel caused by the growth of bacteria. It often follows septicemia or bacteremia and usually occurs in peripheral vessels. See also mycotic aneurysm.

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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.