An aneurysm is an abnormal widening or ballooning of a portion of an artery due to weakness in the wall of the blood vessel.
See also:
It is not clear exactly what causes aneurysms. Some aneurysms are present at birth (congenital). Defects in some of the parts of the artery wall may be responsible.
Common locations for aneurysms include:
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Source: ADAM Encyclopedia
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Source: ADAM Encyclopedia
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Source: ADAM Encyclopedia
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