Endoleaks after EVAR and TEVAR: indications for treatment and techniques.

Endoleaks after endovascular aortic repair (EVAR) are a common cause of treatment failure and secondary interventions. Endoleak classification is important to determine both prognosis as well as need for treatment. With increasingly complex endovascular aortic procedures, endoleak classification according to the original classification has become more difficult. A classification into direct and indirect endoleaks as well as precise anatomical description is often more pragmatic. This manuscript outlines mechanisms of endoleak formation and their treatment.