We were only able to enroll 1 subject so we had no way to compare a control or other study groups and develop any kind of results. This study is essentially the same study as NCT04586452, which we would like to place focus and effort on that study.

The purpose of this research study is to look at whether an investigational imaging agent, 64Cu-DOTA-ECL1i, used during Positron Emission Tomography (PET)/ Computed Tomography (CT) scanning, can help to identify conditions that place patients at an increased risk for AAA rupture. The study is also looking more closely at cellular, molecular and inflammatory properties of the aortic wall. Having the ability to identify markers that predict AAA progression/expansion and risk for rupture could allow the physician to manage patients in a more individualized, personal way.

Abdominal aortic aneurysm (AAA) is a life-threatening degenerative vascular disease characterized by transmural aortic macrophage infiltration, elastin degradation, and reduction of smooth muscle cell content. AAAs occurs later in life and are especially prevalent in men over the age of 65. Patients typically remain asymptomatic until rupture, which is associated with high mortality. Currently, surgical repair is the only approach for AAA treatment, and there is no pharmacological intervention. Clinically, ultrasound and computed tomography measurement of aneurysm diameter represents the mainstay of management and the principal determinant of timing for elective surgical repair. However, this anatomy-based approach fails to provide useful information about the cellular and molecular processes associated with aneurysm expansion and rupture. Therefore, developing translatable molecular biomarkers, specifically expressed by aneurysms, is necessary to determine associated status and progression, capture the risk of rupture, and deliver personalized treatment.

Non-Aneurysmal Patients, (Aim 2A, n=3)

Inclusion Criteria:

- Patients with aortoiliac occlusive disease causing lifestyle limiting claudication, rest pain, and/or tissue loss that requires aortofemoral bypass

Exclusion Criteria:

- Patients with aortoiliac occlusive disease, we will apply the same exclusion criteria as AAA patients.

Abdominal Aortic Aneurysm (AAA) Patients, (Aim 2B, n=5)

Inclusion Criteria:

• We will recruit asymptomatic patients with known AAAs by ultrasound, Doppler, and CT (men ≥ 5.5 cm, women ≥ 5.0cm);
• Both men and women, between the ages of 45 -75;
• With or without active tobacco use;

Exclusion Criteria:

• Inability to receive and sign informed consent;
• Has a history of hypersensitivity to contrast agent, Iopamidol (Isovue)
• Patients with Stage ≥ 4 chronic renal failure (calculated by modification of diet in renal disease eGFR equation [to minimize confounding imaging variables]);
• Inability to tolerate 60 minutes in a supine position with arms down at sides, as necessary for PET/CT;
• Severe claustrophobia;
• Positive pregnancy test or lactating;
• Has a history of hypersensitivity to 64Cu-DOTA-ECL1i or any of its excipients;
• Any condition that, in the opinion of the Sponsor-Investigator or designee could increase risk to the participant, limit the participant's ability to tolerate the research procedures or interfere with collection of the data such as: Symptomatic/recently treated coronary disease, cancer requiring oncologic management, or autoimmune/inflammatory diseases (e.g., rheumatoid arthritis or multiple sclerosis) that are known to have increased associated expression of CCR2.