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>4.0cm
3%
3/95
>4.5cm
6%
6/95
>5.0cm
20%
19/95
>5.5cm
63%
60/95
>6.0cm
5%
5/95
Select Answer to see Preferred Response
Abdominal aortic aneurysms > 5.5cm, even if asymptomatic, are indicated for surgical repair. Abdominal aortic aneurysms (AAA) represent abnormal dilation of the aorta, most often between the renal arteries and the iliac bifurcation. The classic presentation is a male in his 60s or 70s. Although often asymptomatic and discovered incidentally in imaging studies, when symptomatic, patients may present with abdominal or back pain and have a palpable mass on abdominal examination. Risk factors for expansion and rupture of AAAs include large diameter, rapid expansion, tobacco use, hypertension, vasculitis, atherosclerosis, and a family history. Systemic diseases such as Marfan's and syphilis may also affect the abdominal aorta but more commonly affect the thoracic aorta. Diagnosis is with ultrasound or CT of the abdomen. Figure A represents the classic dilation of the aorta seen on CT in a AAA. Illustration A depicts a AAA on ultrasound. Incorrect Answers: Answers 1-3, 5: In an asymptomatic individual, the indication for surgical correction is >5.5cm. Smaller AAAs may be treated if they are symptomatic.
2.4
(5)
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