Recommendation for postoperative surveillance. We recommend baseline imaging in the first month after EVAR with contrast-enhanced CT and color duplex ultrasound imaging. In the absence of an endoleak or sac enlargement, imaging should be repeated in 12 months using contrast-enhanced CT or color duplex ultrasound imaging. Level of recommendation 1 (Strong), Quality of evidence B (Moderate)

If a type II endoleak is observed 1 month after EVAR, we suggest postoperative surveillance with contrastenhanced CT and color duplex ultrasound imaging at 6 months. Level of recommendation 2 (Weak), Quality of evidence B (Moderate)

If neither endoleak nor AAA enlargement is observed 1 year after EVAR, we suggest color duplex ultrasound when feasible, or CT imaging if ultrasound is not possible, for annual surveillance. Level of recommendation 2 (Weak), Quality of evidence C (Low)

If a type II endoleak is associated with an aneurysm sac that is shrinking or stable in size, we suggest color duplex ultrasound for continued surveillance at 6-month intervals for 24 months and then annually thereafter. Level of recommendation 2 (Weak), Quality of evidence C (Low)

If a new endoleak is detected, we suggest evaluation for a type I or type III endoleak. Level of recommendation 2 (Weak), Quality of evidence C (Low)

We suggest noncontrast-enhanced CT imaging of the entire aorta at 5-year intervals after open repair or EVAR. Level of recommendation 2 (Weak), Quality of evidence C (Low)