Unlike abdominal and combined aortoiliac artery aneurysms, isolated iliac artery aneurysms (IIAAs) are uncommon. An isolated iliac artery aneurysm is defined as a twofold increase in the diameter of the iliac artery without a coexisting aneurysm at another location. IIAA was encountered infrequently in the past, comprising 0.9% to 4.7% of all intraabdominal aneurysms according to a review of previous studies; however, in recent times, many asymptomatic IIAAs have been detected incidentally because of the widespread use of abdominal ultrasonography and computed tomography1-3. The frequency of IIAA compared to that of abdominal aortic aneurysm (AAA) ranges from 5.1% to 19.4%4.