Popliteal aneurysm-All are true except-

• Occur in conjunction with aortic aneurysm in 40% cases • Most isolated iliac aneurysm involve common iliac artery (70%) and internal iliac artery (20%) • Multiple iliac aneurysms occur in most patients and are bilateral in 33% cases Etiology • Occur in association with atherosclerosis • Can also occur in pregnancy in absence of atherosclerosis as well as in Marfan and Ehlers-Danlos syndromes, Kawasaki disease, Takayasu’s arteritis, cystic medial necrosis and arterial dissection Clinical Features • More common in males, right and left sides are equally involved • Symptoms are caused by compression of adjacent pelvic structures (bladder, colon, ureter, rectum, lumbosacral nerves and pelvic vein) • Most common iliac aneurysms can be palpated on abdominal exam whereas internal iliac artery aneurysm are more readily palpated on rectal examination Treatment • Operative mortality rate in patients with ruptured iliac aneurysm is 40%. • Iliac aneurysms >3.5 cm are repaired if possible. Minimum Size for Surgery (AIPF: All India Police Force) Abdominal Aortic Aneurysm (5.5 cm) = Iliac aneurysm (3.5 cm) + Popliteal/Femoral aneurysm (2.0 cm)