aneurysm

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Related to aneurismal: aneurysmal, aneurysmal bone cyst

aneurysm

aneurysm (ănˈyo͝orĭzəm), localized dilatation of a blood vessel, particularly an artery, or the heart. Dilatation of an artery, and therefore weakness of that portion of the arterial wall, may be rarely congenital, or it may be caused by syphilis, hypertension (high blood pressure), arteriosclerosis, 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 aorta, the largest vessel in the body, is the one most often affected. Ventricular aneurysms of the heart often occur after myocardial infarctions. 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.

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aneurysm

[′an·yə‚riz·əm]
(medicine)
Localized abnormal dilation of an artery due to weakening of the vessel wall.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

aneurysm

, aneurism
a sac formed by abnormal dilation of the weakened wall of a blood vessel
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
The surgical techniques used have been aneurismal ligation or aneurismal resection plus/minus bypass revascularization [1, 3].
Aneurismal dilation was defined as a greater than 50% increase in the diameter of the SMA.
[2] Giant cells containing lesions in small bones are usually aneurismal bone cyst or giant cell reparative granuloma.
bromyxoid elements: "Solid" variant of aneurismal bone cyst.
Schaller, "Trigeminocardiac reflex during temporary clipping in aneurismal surgery: first description," Journal of Neurosurgical Anesthesiology, vol.
In accordance with other reports, we recently found that local expression of COX-2 was increased in aneurismal tissue.
Labrada's past experience includes clinical research on seven different studies including neuropathy, ischemic stroke, cerebrovascular biorepository, heart valves and aneurismal subarachnoid hemorrhage.
A preoperative cardiac catheterization showed aneurismal dilation and severe tortuosity of left circumflex coronary artery draining into the coronary sinus (Fig.
The possibility of a vascular stump should be considered when an aneurismal lesion is present at the MCA bifurcation with moyamoya phenomenon at distal trunks.