A 71-year-old male ex-smoker with hypertension and hyperlipidemia undergoes abdominal ultrasound screening. The scan reveals a fusiform infrarenal aortic dilatation with concentric mural thrombus and patent lumen. The structure marked **D** (maximum AP diameter) measures 5.8 cm. The patient is asymptomatic without abdominal or back pain. Based on current surveillance and repair guidelines, what is the most appropriate next step in management?

Question

Accepted Answer

D. Elective endovascular or open surgical repair. ## Why Elective endovascular or open surgical repair is right

An aortic diameter of 5.8 cm (marked as **D**) exceeds the established repair threshold of ≥5.5 cm in men, as defined by the USPSTF, SVS, and ESVS guidelines. At this size, the annual rupture risk rises sharply to approximately 10% per year. The patient is asymptomatic, making him a candidate for elective repair (either EVAR if anatomy is suitable, or open repair), which offers superior outcomes compared to expectant management. Pre-operative CTA with runoff should be obtained to assess aortic anatomy, neck length, angulation, iliac access, and candidacy for EVAR versus open repair.

## Why each distractor is wrong

- **Ultrasound surveillance every 6 months**: This is the appropriate interval for aortic diameters of 5.0–5.4 cm, not 5.8 cm. At 5.8 cm, surveillance alone is inadequate; repair is indicated.
- **Ultrasound surveillance every 12 months**: This interval applies to diameters of 4.0–4.9 cm. A diameter of 5.8 cm has crossed the repair threshold and does not warrant surveillance alone.
- **Clinical follow-up without imaging for 2 years**: This is inappropriate at any AAA size ≥5.5 cm and would expose the patient to unacceptable rupture risk.

**High-Yield:** AAA repair is indicated at ≥5.5 cm in men and ≥5.0 cm in women; at 5.8 cm, elective repair (EVAR or open) is standard of care, not surveillance.

[cite: SVS AAA Guidelines 2018; USPSTF 2019; ESVS 2024]

Answer

A. Clinical follow-up without imaging for 2 years

Answer

B. Ultrasound surveillance every 6 months

Answer

C. Ultrasound surveillance every 12 months

Explanation

Why Elective endovascular or open surgical repair is right

Why each distractor is wrong

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