Endoleak classification

Isecondary to inadequate seal at the EVAR anchor site; occurs in up to 10% of case, almost never resolves and usually requires treatment to reseal the defect
IIthe sac fills retrogradely via branch vessels arising from the lumbar, inferior mesenteric or internal iliac arteries and occurs in up to 25% of cases
IIImechanical failure due to defect on the graft or separation of the modular components
IVsecondary to graft porosity and almost always resolves within a few days post repair
Vendotension – expansion of aneurysm sac without demonstrable abnormality on CT angiography