A 42-year-old woman with acute myocardial infarction.

CLINICAL INTRODUCTION: A 42-year-old woman presented with anterior ST elevation myocardial infarction. Urgent coronary angiography revealed tapering then occlusion of the distal left anterior descending (LAD) coronary artery with no flow in the distal LAD (figure 1A). Balloon angioplasty with a 2.0×8 mm balloon re-established flow into the distal LAD. An angiogram of the right external iliac artery was also performed (figure 1B).heartjnl;104/19/1607/F1F1F1Figure 1Invasive angiography of the left coronary system (A) and the right external iliac artery (B). The coronary angiogram (A) shows tapering and then occlusion (arrow) of the distal left anterior descending coronary artery.

QUESTION: Which of the following explains the abnormal appearance of the external iliac artery (figure 1B)?Atherosclerosis.Concertina effect.Fibromuscular dysplasia.Perforation.Multiple aneurysms.