What is a defining characteristic of a Type III endoleak?

A Type III endoleak is characterized by a leak that occurs through a defect in the stent graft itself. This could involve either separated components of the graft or a material defect, which leads to blood leaking from the lumen of the graft back into the an aneurysmal sac. Understanding this helps in diagnosing the condition accurately, as it distinguishes Type III from other types of endoleaks that might occur at the graft ends or through collateral channels.

The defining feature of Type III endoleaks is critical for interventional radiologists when choosing an appropriate intervention strategy, as addressing a defect in the graft fabric may require different considerations compared to leaks arising from other mechanisms. Identification of this type of endoleak is essential because it can lead to expansion of the aneurysm sac and potential rupture if left untreated.

This understanding of Type III endoleaks is pivotal in interventional radiology practice, where quick and accurate diagnosis is vital for patient outcomes.