In suspected abdominal aortic aneurysm, what is the initial imaging study of choice to determine presence, size, and extent?

In suspected abdominal aortic aneurysm, what is the initial imaging study of choice to determine presence, size, and extent?

• A. CT with contrast
• B. Abdominal ultrasound
• C. MRI
• D. X-ray

Answer: (B)

Abdominal ultrasound is the best initial test here because it quickly confirms whether an aneurysm is present and accurately measures the maximal aortic diameter without exposing the patient to radiation. It’s fast, widely available, and noninvasive, making it ideal for quick decision-making when an abdominal aortic aneurysm is suspected. A diameter exceeding about 3 cm defines an aneurysm, and the ultrasound measurement helps gauge rupture risk and the need for urgent care. While ultrasound provides a good initial assessment of presence and size and can give a sense of extent along the aorta, CT with contrast is typically used next for detailed anatomical mapping and surgical planning, especially if repair is being considered. MRI serves a similar role but is less practical in acute settings, and plain X-ray offers little diagnostic value for AAA.

Abdominal ultrasound is the best initial test here because it quickly confirms whether an aneurysm is present and accurately measures the maximal aortic diameter without exposing the patient to radiation. It’s fast, widely available, and noninvasive, making it ideal for quick decision-making when an abdominal aortic aneurysm is suspected. A diameter exceeding about 3 cm defines an aneurysm, and the ultrasound measurement helps gauge rupture risk and the need for urgent care. While ultrasound provides a good initial assessment of presence and size and can give a sense of extent along the aorta, CT with contrast is typically used next for detailed anatomical mapping and surgical planning, especially if repair is being considered. MRI serves a similar role but is less practical in acute settings, and plain X-ray offers little diagnostic value for AAA.