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After EVAR — endoleaks, complications and surveillance

After endovascular repair of an abdominal aortic aneurysm (EVAR) blood may continue to enter the aneurysm sac — an "endoleak"; type I and III endoleaks are high-pressure and need prompt repair, a type II endoleak is the commonest and is usually observed as long as the sac does not grow, so every patient after EVAR needs lifelong imaging surveillance.

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Why it matters in the exam

This topic recurs in every vascular surgery exam. The types: type I — leak at the graft attachment site (Ia at the proximal neck, Ib at the distal iliac seal, Ic at an iliac occluder plug), transmitting full arterial pressure to the sac and risking rupture; type II — retrograde flow into the sac from lumbar arteries or the inferior mesenteric artery, the commonest type; type III — failure of the graft itself, separation between components (IIIa) or a fabric tear (IIIb), also high-pressure; type IV — leak through graft porosity at implantation, self-limiting; and type V (endotension) — sac growth without a visible leak. Distinguishing the types determines treatment, so questions describe a CT and ask for identification.

Treatment by type: Ia — proximal extension (cuff), a neck stent, endoanchors, a fenestrated graft or conversion to open surgery; Ib — extension of the distal limb into the iliac artery; III — relining the defective area with another graft. Type II is treated only when the sac grows by 10 mm or more, by transarterial or translumbar embolisation. Surveillance according to ESVS 2024: CT angiography in the first month after implantation; if there is no endoleak and the seal is good — ultrasound surveillance (with contrast as needed) at risk-adjusted intervals, and CT when there is growth or suspicion. Other complications: graft limb occlusion (sudden claudication or leg ischaemia), graft migration, infection, and "post-implantation syndrome" — fever and inflammation in the first days without infection. In percutaneous femoral access, heavy anterior wall calcification, a small femoral artery and obesity are relative contraindications.

Anatomy suitable for EVAR by the manufacturer's instructions usually includes a neck length of at least 10–15 mm, a neck diameter up to 32 mm, angulation up to 60 degrees and iliac arteries wide enough for access.

Key points

• I and III — high pressure, prompt repair.
• II — the commonest; treat only with growth of 10 mm or more.
• CT angiography in the first month.
• Lifelong surveillance.
• Sudden claudication — graft limb occlusion.

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Sources

• ESVS Clinical Practice Guidelines on the Management of Abdominal Aorto-iliac Artery Aneurysms, 2024 — Follow-up after EVAR and management of endoleaks
• SVS practice guidelines on the care of patients with an abdominal aortic aneurysm, 2018 — Post-EVAR surveillance and endoleaks
• Rutherford's Vascular Surgery and Endovascular Therapy, 10th edition (2022) — Endovascular aneurysm repair

Sources are given for further reading; the text is written afresh and not copied from them.

Reviewed by the Examqo AI Professor · 2026-11-06. The text may contain errors; when in doubt, check the source.