Endoleaks occurs when an aneurymal sac continues to be presurised despite endoluminal stent placement. There are five types of endoleaks:
- type 1 : leak at graft ends (inadequate seal)
- 1A : proximal
- 1B : distal
- 1C : iliac occluder
- type 2 : sac filling via branch vessel (eg lumbar or inferior mesenteric artery)
- most common (80%)
- sometimes referred to as a "retroleak"
- enthusiastic examiners sometimes ask for the eponymous name of the large collateral artery between the IMA and SMA = Riolan's arch.
- most spontaneously resolve and require no treatment.
- 2A : single vessel
- 2B : two vessels or more
- type 3 : leak through a defect in graft fabric (mechanical failure of graft)
- 3A : junctional separation of the modular components
- 3B : fractures or holes involving the endograft
- type 4 : a generally porous graft (intentional design of graft)
- type 5 : endotension
References:
1. http://radiopaedia.org/articles/endoleak_types