Types of endoleak

Type of endoleak	Definition
Type I
Ia	Inadequate seal at proximal end of endograft
Ib	Inadequate seal at distal end of endograft
Ic	Inadequate seal at iliac occluder plug
Type II	Flow from visceral vessel (lumbar, IMA, accessory, renal, hypogastric) without attachment site connection
Type III
IIIa: component disconnection	Flow from module disconnection
IIIb: stent fabric disturbance	Flow from fabric disruption (minor: <2 mm; major: ≥2 mm)
Type IV	Flow from porous fabric (<30 days after graft placement)
Endoleak of undefined origin (Type V)	Flow visualized but source unidentified

IMA: inferior mesenteric artery.

Reproduced from: Chaikof EL, Blankensteijn JD, Harris PL, et al. Reporting standards for endovascular aortic aneurysm repair. J Vasc Surg 2002; 35:1048. Table used with the permission of Elsevier Inc. All rights reserved.

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Types of endoleak