Which study is most appropriate for serial assessment of an abdominal aortic aneurysm?

• A. Plain Film of the Abdomen
• B. Serial Abdominal Exam
• C. Ultrasound of the Abdomen
• D. Angiography of the Abdominal Aorta

Answer: (C)

Tracking the size of an abdominal aortic aneurysm over time is the key goal in serial assessment. Ultrasound is ideal because it is quick, safe, and inexpensive, and it provides accurate, repeatable measurements of the aorta’s maximum diameter without exposing the patient to radiation. By performing regular ultrasounds, clinicians can monitor growth rate and intervene if the aneurysm enlarges beyond thresholds or shows rapid expansion.

Other options don’t fit as well for ongoing monitoring. A plain abdominal film can reveal calcifications but does not reliably quantify aneurysm size or growth. Angiography offers detailed lumen anatomy but is invasive and involves contrast and radiation, making it unsuitable for routine follow-up. CT or MRI can give precise measurements and detailed anatomy, but they’re more costly and typically reserved for preoperative planning or complex cases rather than regular surveillance.