Treatment options for isolated iliac artery aneurysms and their impact on aortic diameter after treatment.

Purpose: Isolated iliac artery aneurysm (IIAA) is uncommon. It is frequently treated by endovascular aneurysm repair (EVAR). This study was to evaluate treatment results of IIAA and survey aortic diameter after EVAR. Methods: Patients treated for IIAA in Seoul St. Mary's Hospital and Bundang Seoul National University from 2005 to April 2016 were retrospectively enrolled. The inclusion criteria of IIAA was >30 mm of iliac artery aneurysm without abdominal aortic aneurysm, which was treated by open surgical repair (OSR) or EVAR. Patients' clinical characteristics, treatment results, and mortality were obtained from electronic medical records. Diameters of aorta and iliac arteries were measured periodically with scheduled interval based on CT scans. Results: Forty-nine patients (40 males: mean age, 71.9 +/- 11.1 years) were enrolled. Five ruptured IIAAs were treated with EVAR (n =1) or hybrid methods (n = 4). The diameter of ruptured IIAAs was 65 +/- 31.4 mm, which was not significantly different from that of elective (44.3 +/- 17.0 mm). Forty-four elective IIAA underwent 9 OSR, 31 EVARs, and 3 hybrid treatments (15 bifurcated and 12 straight stent-grafts). Treatment success rate was 93.8% without hospital mortality. There were 4 type I endoleak, 1 type II endoleak, and 1 type III endoleak without aneurysm-related mortality during followup. However, the aortic diameter was increased over time though there was no change or decrease in common iliac artery's diameter. Conclusion: Treatment of IIAA included various endovascular modalities as well as open surgery. Regular surveillance is still needed due to aortic dilatation after its treatment.