Abstract
A 35-year-old male was hospitalized with a pulsatile mass in the left shoulder region. He had a history of uncontrolled hypertension for more than 5 years. A computed tomography angiogram revealed a giant left subclavian artery aneurysm and also an aortic coarctation (A). Interestingly, hypoplasia of the right common/external iliac arteries was present, and significant collateral circulation was noted between the right subclavian artery and the distal right external iliac artery, restoring blood flow to the right lower extremity (B). This could explain why this patient had a normal ankle brachial index and did not suffer from intermittent claudication.
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