Most common cause of abdominal aortic aneurysm is:

• “90% all abdominal aortic aneurysms are related to atherosclerotic disease and most of these aneurysms are below the level of renal arteries.” • Aneurysm: permanent and irreversible localized dilatation of blood vessel with at least 50% increase in diameter • Ectasia: dilatation <50% of normal diameter • AAA (abdominal aortic aneurysm) is diagnosed if diameter >3 cm in males or >2.6 cm in females • MC location: Aorta >Iliac >Popliteal >Femoral (AIPF) • MC site of extra-cranial arterial aneurysm is infrarenal aorta • MC site of peripheral aneurysm: Popliteal aneurysm • Degenerative aneurysms (caused by atherosclerosis) are MC AAA (90%) • Width of aneurysm is most important predicting factor of rupture. • Juan Parodi introduced endovascular aortic aneurysm repair (EVAR). Classification • True (all three layers of vessel are involved), false (do not have all three layers of vessel) • Infected (mycotic) aneurysm are false aneurysm • Dissecting aneurysm (dissection with aneurysmal dilatation of false lumen) • Fusiform (symmetrical enlargement involving whole circumference of artery) • Saccular (affect only part of the arterial circumference) have higher risk of rupture