What is the appropriate imaging method for screening and follow-up of an abdominal aortic aneurysm (AAA)?

Ultrasound is recognized as the appropriate imaging method for screening and follow-up of an abdominal aortic aneurysm (AAA). This is largely due to its non-invasive nature, cost-effectiveness, and the fact that it does not involve ionizing radiation, making it safe for repeated use in follow-up assessments.

Ultrasound provides a reliable way to visualize the aorta and measure the size of an aneurysm, which is crucial for monitoring its growth over time. Regular ultrasound evaluations allow clinicians to determine whether intervention is needed based on the size and progression of the aneurysm.

While CT scans are highly detailed and can provide comprehensive information about the anatomy and any complications related to AAA, they typically involve exposure to radiation and are therefore less suitable for routine screening. X-rays offer limited information regarding vascular structures and are not used for imaging aneurysms specifically. MRI, while capable of excellent soft tissue contrast and not using radiation, is more expensive, less accessible in many settings, and usually not the first choice for routine aneurysm evaluation.