ABSTRACT
PART 1: INTRODUCTION The majority of endovascular treatment for the abdominal aorta is for abdominal aortic aneurysms (AAAs). Endovascular aortic aneurysm repair (EVAR) has gained wide acceptance, and there has been a significant increase in the number of AAAs treated by EVAR (1,2). However, not all AAA cases are indicated to undergo EVAR. Patient selection of EVAR involves careful assessment of the anatomical features of aneurysm. The indications vary according to device; however, to summarize the preferable anatomy for EVAR (3,4), (i) the proximal neck’s length should be long enough (15 mm or longer), orientation should be relatively straight (60◦ or less), and diameter should be 28 mm or less; (ii) as an access route, the iliac artery should be large enough (6-7 mm or more) without extreme tortuosity, bending, or calcification; and (iii) the distal neck should be 10 mm or longer. Conversely, it can be said that cases that do not include these anatomical criteria involve factors that make EVAR difficult. In addition, the presence of neck thrombus and calcification is known to affect the ability to achieve adequate seal between the device and the aortic wall.
