Welcome to Classifications and Online Calculators in Radiology

This site was build along with the Atlas of Radiology Images to support your knowledge in radiology.

You will find here:

that are used in radiology and related fields with free access.


  • Some pages are accompanied by illustrations
  • All pages contain tags for easy navigation

The concept

The concept of this website is based on a previous site that was founded in 2008 and is still up and running. The website is composed as a book, where all sources are properly referenced, according to a good practice in scientific publications.

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    Endoleak - types of endoleaks after endovascular aneurysm repair (EVAR)

    The term "endoleak" was proposed in 1996 by White et al. in a letter to editor, where the authors described its basic types. It refers to a failure of endovascular aneurysm repair (EVAR) with persistent blood flow within an aneurysm sac but outside the lumen of the endoluminal graft. Persistent endoleak causes continued pressurization of the aneurysm with the risk of its rupture as a consequence.

    Type Subtype Description
    Type I   insufficient seal at the site of graft attachment - at proximal or distal end, or at overlap of components
      Ia around the proximal end of the body of stentgraft
      Ib around the distal end of the body of stentgraft
      Ic around the distal end of the iliac component
    Type II   perfusion of the aneurysm sac via branch or collateral vessels
      IIa single vessel
      IIb ≥2 vessels
    Type III   endoleak throught a defect in the stentgraft or inadequate sealing of overlapping stentgraft components
      IIIa junctional separation of overlapping stentgraft components
      IIIb defect in the stentgraft - fracture of the stentgraft or rupture of the graft fabric
    Type IV   leak through the stentgraft fabric due to its porosity
    Type V   endotension - expansion of the aneurysm continues despite no evidence of leak on imaging


    1. White GH, Yu W, May J. Endoleak--a proposed new terminology to describe incomplete aneurysm exclusion by an endoluminal graft. J Endovasc Surg. 1996 Feb;3(1):124–5.
    2. Cao P, De Rango P, Verzini F, Parlani G. Endoleak after endovascular aortic repair: classification, diagnosis and management following endovascular thoracic and abdominal aortic repair. J Cardiovasc Surg (Torino). 2010 Feb;51(1):53–69

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