We assessed the usefulness of ultrashort TE (UTE) 4D-MR angiography for giant aneurysms treated with flow-diverter stents. We evaluated the depiction of flow in the stents, and visualization of hemodynamic vascular flow in aneurysms. The newly developed UTE 4D-MRA could visualize flow in the stents at the acceptable quality for diagnosis, and hemodynamic vascular flow in aneurysms were comparable to X-ray DSA. Moreover, UTE 4D-MRA showed intraaneurysmal flow within the coil which was difficult to visualize even with X-ray DSA. Our study demonstrated that UTE 4D-MRA was adequate to visualize the hemodynamic vascular flow in aneurysms, and might be useful.