The natural history of type 2 endoleaks after endovascular aneurysm repair justifies conservative management.

Objective Management of type 2 endoleaks after endovascular aneurysm repair has been controversial. Some advocate for conservative management, while others believe that intervention is indicated. This study investigated the natural history of type 2 endoleaks in order to derive direction in management. Methods Patients who had endovascular aneurysm repair at the Veterans Affairs Long Beach were retrospectively identified and computerized tomographic angiography was independently reviewed by a radiologist and a vascular surgeon. Type 2 endoleaks were analyzed for the following outcomes: rupture, duration of endoleak, spontaneous resolution, changes in the size of the aneurysm sac, and reintervention rates. Results Of the 160 patients who had completed required follow-up to date (mean 3 years) after endovascular aneurysm repair, 39 (24.4%) patients were identified as having a type 2 endoleak on computerized tomographic angiography imaging. 6 (15.4%) of these 39 patients required repair due to aneurysm sac growth >1 cm. 2 (5.13%) were repaired with an open procedure and 4 (10.3%) with an endovascular approach. Of these 6 aneurysm leaks requiring repair, 4 (66.7%) had a simultaneous endoleak (types 1 or 3) in addition to the identified type 2 endoleak. Spontaneous resolution of type 2 endoleaks occurred in 16 (41.0%) patients. 4 patients (10.3%) had delayed type 2 endoleaks that presented 4, 9, 12, and 23 months after their 30 day post op computed tomography was normal. None of the 4 patients with delayed type 2 endoleaks required reintervention and none had aneurysm sac growth greater than 5 mm. Conclusions Overall, we found that 85% of patients who had type 2 endoleaks did not require intervention after a mean follow-up time of 3 years. The association of a type 1 or 3 endoleak with a type 2 endoleak was more likely to require correction due to aneurysm expansion >1 cm, thus type 2 endoleaks associated with another type of endoleak require more aggressive management.