Box 1: Subtypes of endoleaks
Type of endoleakDefinitionCharacteristics and management
Type ILeak of graft ends (inadequate seal)High pressure, high risk. Requires urgent reintervention
Type IISac filling via branch vesselLow pressure. Intervention on branch vessel may be required depending on sac growth
Type IIILeak via defect in graft fabricHigh pressure, high risk. Requires urgent reintervention
Type IVPorous graftMost frequently self-limited and requires no treatment
Type VEndotensionIncompletely understood pathophysiology and difficult diagnosis. Treatment controversial; may warrant reintervention
  • Adapted from: White GH, Yu W, May J, et al. Endoleak as a complication of endoluminal grafting of abdominal aortic aneurysms: classification, incidence, diagnosis and management. J Endovascular Surg 1997;4:152–168.