endoleak
Persistent blood flow outside an endograft lumen but within the aneurysm sac, classified by anatomical location and flow characteristics.
Full Definition
An endoleak represents persistent blood flow outside the endograft lumen but within the aneurysm sac following endovascular aneurysm repair (EVAR). Endoleaks are classified into five types based on their anatomical origin and flow characteristics: Type I (attachment site), Type II (retrograde branch vessel flow), Type III (graft fabric tear or modular separation), Type IV (graft porosity), and Type V (endotension without visible leak). Detection and classification of endoleaks are crucial for post-EVAR surveillance, as they may lead to aneurysm sac pressurization and potential rupture.
Usage
Usage note: Always specify endoleak type and anatomical source when present.
In Context
- "A Type II endoleak was identified arising from the inferior mesenteric artery with late-phase enhancement." — Post-EVAR surveillance CT
- "No evidence of endoleak was seen on the current study, indicating successful aneurysm exclusion." — Follow-up imaging report