This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': 'Popliteal aneurysm-All are true except- \nSelect and explain. \nA. Presents as a swelling behind the knee, B. Presents with symptoms due to complication, C. Surgery is indicated in case of complication, D. Uncommon among peripheral aneurysm', 'role': 'user'}, {'content': 'Answer: D \nExplanation: • Occur in conjunction with aortic aneurysm in 40% cases\n• Most isolated iliac aneurysm involve common iliac artery (70%) and internal iliac artery (20%)\n• Multiple iliac aneurysms occur in most patients and are bilateral in 33% cases\nEtiology\n• Occur in association with atherosclerosis\n• 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\nClinical Features\n• More common in males, right and left sides are equally involved\n• Symptoms are caused by compression of adjacent pelvic structures\xa0(bladder, colon, ureter, rectum, lumbosacral nerves and pelvic vein)\n• Most common iliac aneurysms can be palpated on abdominal exam whereas internal iliac artery aneurysm are more readily palpated on rectal examination\nTreatment\n• Operative mortality rate in patients with ruptured iliac aneurysm is 40%.\n• Iliac aneurysms >3.5\xa0cm are repaired if possible.\nMinimum Size for Surgery (AIPF: All India Police Force)\nAbdominal Aortic Aneurysm (5.5 cm) = Iliac aneurysm (3.5 cm) + Popliteal/Femoral aneurysm (2.0 cm)', 'role': 'assistant'}]