Classification, surgical-threshold check and surveillance interval — SVS 2018 (abdominal) and ACC/AHA 2022 (thoracic).
Measurement
Use the maximal outer-to-outer diameter perpendicular to the vessel axis.
cm
Optional: growth rate from a prior study
cm
Result
Enter a diameter…
Report line will appear here.
Abdominal (SVS 2018). Aneurysm ≥ 3.0 cm. Surveillance: 3.0–3.9 cm every 3 years; 4.0–4.9 cm every 12 months; 5.0–5.4 cm every 6 months. Elective repair at ≥ 5.5 cm (men) or ≥ 5.0 cm (women), symptoms, or rapid growth (> 0.5 cm/6 mo).
Thoracic (2022 ACC/AHA). No fixed interval table — re-image a newly identified aneurysm at 6–12 months to establish stability, then every 6–24 months by size, growth and etiology. Surgical thresholds: degenerative/tricuspid ≥ 5.5 cm (≥ 5.0 cm at experienced centers); Marfan ≥ 5.0 cm (≥ 4.5 cm high-risk, experienced centers); bicuspid as for degenerative. Growth ≥ 0.3 cm/year over 2 years favors earlier intervention.
Reference only — surveillance and operative decisions are individualized. Sources: Society for Vascular Surgery AAA guideline (J Vasc Surg 2018) and 2022 ACC/AHA Aortic Disease Guideline (Circulation 2022).