What is it?
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Abnormal dilation (ballooning) of an artery caused by the pressure of blood flowing through a weakened area.
What does it affect?
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Aneurysms most commonly affect the aorta and arteries supplying the brain.
Common Cause
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Most common cause of an aneurysm is atherosclerosis, a condition in which fatty deposits weaken the artery wall.
Site of atherosclerotic aneurysms.
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The aorta is the usual site of atherosclerotic aneurysms. Less commonly, aneurysms may be due to a congenital weakness of the artery walls.
Most cerebral aneurysms
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Most cerebral aneurysms, known as berry aneurysms because of their appearance, are congenital.
Marfan’s syndrome
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Marfan’s syndrome, an inherited disorder in which the muscular layer of the aorta is defective, is often associated with aneurysms just above the heart.
How arterial wall can be weakened?
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Arterial wall can also be weakened by inflammation, as occurs in polyarteritis nodosa.
Symptoms
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Most aneurysms are symptomless and remain undetected, but if the aneurysm expands rapidly and causes pain, or it is very large, the symptoms are due to pressure on nearby structures
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