Fig. 3

Hemodynamic characteristics of the aneurysmal recanalization. In pre-procedure, immediate post-procedure, and 18-month follow-up angiographic images, the anterior communicating artery (Acom) showed recanalization (arrows in A–C), while the left posterior communicating artery (Pcom) was still completely occluded (arrows in E–G). The hemodynamic alterations are shown comparing the pre-procedure (D, I, K, M, and O) and post-procedure (H, J, L, N, and P) images. Compared with pre-procedure result, the Streamlines results show that the flow of the Acom aneurysm was still evident (upper arrows in D and H), while the flow of the Pcom aneurysm was well-modified (lower arrows in D and H). The velocity profiles at both the neck and the sac of the aneurysm are additionally illustrated. The Acom aneurysm displayed a concentration of maximum blood flow at the neck area, persisting near the inflow region where recanalization later emerged, as observed in follow-up images. In contrast, the Pcom aneurysm presented a considerable decrease in velocity, lacking any areas of increased or focal velocity on the sectional plane of the neck.(arrows in M–P)