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¹Shinko Memorial Hospital, Department of Neurosurgery, Kobe, Japan DOI : 10.5137/1019-5149.JTN.21334-17.2 Endovascular treatment of bifurcation aneurysms is difficult and complicated because arterial branches may arise from the aneurysmal neck. We treat these cases with complex techniques such as Y or T stenting. In this report, we deployed one Neuroform EZ stent using the intentional herniation technique for the preservation of arterial branches. A 78-year-old female presented with two unruptured aneurysms. One was an 8 mm aneurysm located at the bifurcation of the internal carotid artery and the posterior communicating artery (PcomA). The other was an 11 mm aneurysm located at the cavernous segment of the internal carotid artery. A 4.5×20 mm Neuroform EZ stent was placed across the aneurysm neck. The delivery wire and microcatheter were pushed during deployment, similar to braided stents. High resolution cone beam computed tomography (CT) after stenting revealed the stent strut to be vertically aligned near the aneurysmal sac, and the PcomA orifice was preserved. We performed coil embolization easily and achieved acceptable obliteration. Our intentional herniation technique may be useful in some cases. Open cell stents have some advantages depending on the method of deployment. Keywords : Neuroform EZ stent, High resolution cone beam CT, Stent assisted coil embolization