Aneurysm

ANEURYSMS

Daffar Dr.Ahmed Abdul-Ameer
Thoracic & Vascular Surgeon

Abdominal aortic aneurysm

Definition

An aneurysm is dilatation of an artery greater than 1.5 times its normal diameter.
The most common sites are (aortic > iliac > popliteal > femoral arteries).
Other arteries are affected less commonly.

Classification

Aneurysms are classified based upon:
Wall constituents
True aneurysms which contain all the three layers of the arterial wall.
False aneurysm when the intact adventitia or the surrounding tissues prevent rupture of artery after trauma.



Shape
Saccular aneurysms
Fusiform aneurysms

CT-Angiography of true aneurysm

Etiology

Congenital aneurysms
Acquired aneurysms may be caused by atherosclerosis, trauma, infection (mycotic), medial cystic necrosis, and syphilis (rare today).


Most traumatic aneurysms today are due to arterial catheterization or penetrating injuries.

Salmonella and Staphylococcus, are now the most common organisms cultured from mycotic aneurysms.

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