Types of endoleak after endovascular repair^[1]

The types of endoleaks after an endovascular repair of an abdominal aortic aneurysm are as follows:

Type I is due to an incompetent seal at the proximal (Ia) or distal (Ib) attachment site.
Type II results from flow into and out of the aneurysm sac from one or more patent branch vessels (lumbar or inferior mesenteric artery).
Type III results from dissociation of modular components.
Type IV is due to leaks through the porous graft material.
Endoleak of undefined origin (type V) is continued aneurysm sac expansion without a demonstrable endoleak on any imaging modality. It is also referred to as endotension.

Reference:

Chaikof EL, Blankensteijn JD, Harris PL, et al. Reporting standards for endovascular aortic aneurysm repair. J Vasc Surg 2002; 35:1048.

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Types of endoleak after endovascular repair[1]