Classification of gutter type in parallel stenting during endovascular aortic aneurysm repair

Gutters have been associated with an increased risk of type Ia endoleaks and are considered to be the Achilles' heel of chimney endovascular aneurysm repair (ch-EVAR). However, there is no classification yet to classify and quantify gutter types after ch-EVAR. The proposed gutter classification enables a uniform nomenclature in the current ch-EVAR literature, a more accurate risk assessment of gutter-associated endoleaks, and allows monitoring of eventual progression of gutter size during follow-up.