Management of Ectatic Bilateral Common Iliac Arteries

Size-Based Risk Assessment

The American College of Cardiology recommends a repair threshold of 3.5 cm for common iliac artery aneurysms, as established by the 2022 ACC/AHA guidelines 1
The rupture risk is extremely low for iliac aneurysms with dimensions ≤3.8 cm, with no ruptures reported in a large case series of 438 patients followed for 3.7 years 3, 1
Ruptured iliac aneurysms have a median diameter of 6.8 cm at presentation, indicating a low-risk territory for patients with smaller aneurysms 3

For iliac arteries measuring 2.0-2.9 cm, ultrasound surveillance should be performed every 12 months to monitor for growth, as recommended by the American College of Cardiology 2
The growth rate of iliac aneurysms should be calculated, with normal growth averaging 2.9 mm/year, and accelerated growth (>3 mm/year) potentially warranting earlier intervention 3, 1
If the diameter reaches 3.0-3.4 cm, the surveillance frequency should be increased to every 6 months, and CT angiography should be considered as the size approaches 3.5 cm for pre-intervention planning 2

Patients with iliac artery ectasia should be evaluated for concomitant abdominal aortic aneurysm (AAA), as 20-40% of patients have coexisting AAA, according to the American College of Cardiology 2, 4
Comprehensive imaging of the entire aortoiliac system is necessary, as 86% of patients with common iliac artery aneurysms have current or previously treated AAA 3, 1

Smoking cessation is strongly advised to reduce the risk of aneurysm expansion, as recommended by the American College of Cardiology 4
Beta-blockers may be considered to reduce the rate of aneurysm expansion, and control of hypertension and atherosclerotic risk factors is essential 4

Premature intervention should be avoided, as it can expose patients to unnecessary procedural risks, including buttock claudication, erectile dysfunction, and bowel ischemia 3, 1, 2, 4
If future endovascular AAA repair is planned, common iliac arteries ≥18 mm have significantly higher rates of type Ib endoleaks and late reinterventions, which may influence graft selection and landing zone planning 3