type II endoleak
Retrograde flow into the aneurysm sac through patent branch vessels, most commonly lumbar arteries or inferior mesenteric artery.
Full Definition
A type II endoleak is the most common complication following endovascular aneurysm repair (EVAR), characterized by retrograde blood flow into the aneurysm sac through patent side branches such as lumbar arteries, inferior mesenteric artery, or accessory renal arteries. These endoleaks maintain pressure within the aneurysm sac and may lead to continued sac expansion and potential rupture risk. Type II endoleaks are classified based on their source vessels and flow patterns, with some resolving spontaneously while others require intervention through embolization or surgical ligation. Management remains controversial, with treatment typically reserved for persistent leaks associated with sac growth.
Usage
Usage note: Use Roman numerals (II) rather than Arabic numerals (2) when referring to endoleak classification.
In Context
- "Follow-up CT revealed a persistent type II endoleak from lumbar arteries with stable sac size." — surveillance report
- "The type II endoleak was successfully treated with selective embolization of the feeding vessels." — intervention note