Fig 5.

Case 4. A 70-year-old man with a medially projecting, unruptured aneurysm on the paraclinoid segment of the right ICA. A, 3D TOF MRA image. B, 4D flow MR image shows that the inflow enters through the area along the distal margin of the neck. The angle of the section plane that identifies the aneurysm orifice with respect to the imaging section direction on 3D TOF MRA is 65°. C, 4D flow MR imaging shows the inflow zone (yellow). D, TC 3D MRA image depicts the putative inflow zone on the proximal neck. Red indicates the area where the MR signal intensity exceeded 395.