Imaging modalities for endoleak surveillance

Area of Science:

• Vascular Surgery
• Medical Imaging
• Radiology

Background:

• Abdominal aortic aneurysm (AAA) is a growing concern with an aging population.
• Endovascular aortic repair (EVAR) is increasingly favored for AAA treatment.
• Post-EVAR surveillance is vital for detecting complications, particularly endoleaks, which risk aortic rupture.

Purpose of the Study:

• To review and discuss the various imaging modalities used for endoleak detection and evaluation after EVAR.
• To assess the utility and limitations of each imaging technique in surveillance.

Main Methods:

• Review of current literature on imaging modalities for endoleak surveillance.
• Discussion of plain X-ray, duplex ultrasonography, contrast-enhanced ultrasound, computed tomography angiography (CTA), and magnetic resonance angiography (MRA).
• Mention of novel techniques such as 4D ultrasound and nuclear medicine.

Main Results:

• Plain X-ray detects gross graft abnormalities but cannot classify endoleak type.
• Duplex ultrasound provides anatomical and flow data, but observer variability exists.
• CTA offers detailed anatomical information but involves radiation and contrast risks.
• MRA has comparable sensitivity to CTA without radiation but suffers from artifacts.
• Contrast-enhanced ultrasound is an emerging alternative to CTA.

Conclusions:

• No single imaging modality is perfect for endoleak surveillance.
• A combination of techniques or modality selection based on clinical context is often necessary.
• Continued research into novel imaging methods is essential for improved endoleak detection and patient management.