Endovascular Aneurysm Repair (EVAR) is an innovative technique for the treatment of abdominal aortic aneurysm (AAA). However, complex anatomies characterized by localized aneurysms close to the renal arteries and vessel tortuosity lead to post-operative complications. To help prevent them, a computational study explores hemodynamics within the stents. The aim of this work is to compare the hemodynamic impact of different endoprosthesis in a male 68 years old patient having a short aortic neck and a fenestrated stent (f-EVAR) implant, which was affected to a iliac arteries rotation after surgery. Patient-specific CAD models of the aorta before the intervention (preOP) and after the f-EVAR implant are built using a manual segmentation by the CT-scans.