Wonhyoung Park1, Yunsun Song2, Kye Jin Park2, Hae-Won Koo2, Kuhyun Yang2, Dae Chul Suh2. 1. Department of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.; Department of Neurosurgery, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea. 2. Department of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
Abstract
PURPOSE: Hemodynamic factors are considered to play an important role in initiation and progression of the recurrence after endosaccular coiling of the intracranial aneurysms. We made paired virtual models of completely coiled aneurysms which were subsequently recanalized and compared to identify hemodynamic characteristics related to the recurred aneurysmal sac. MATERIALS AND METHODS: We created paired virtual models of computational fluid dynamics (CFD) in five aneurysms which were initially regarded as having achieved complete occlusion and then recurred during follow-up. Paired virtual models consisted of the CFD model of 3D rotational angiography obtained in the recurred aneurysm and the control model of the initial, parent artery after artificial removal of the coiled and recanalized aneurysm. Using the CFD analysis of the virtual model, we analyzed the hemodynamic characteristics on the neck of each aneurysm before and after its recurrence. RESULTS: High wall shear stress (WSS) was identified at the cross-sectionally identified aneurysm neck at which recurrence developed in all cases. A small vortex formation with relatively low velocity in front of the neck was also identified in four cases. The aneurysm recurrence locations corresponded to the location of high WSS and/or small vortex formation. CONCLUSION: Recanalized aneurysms revealed increased WSS and small vortex formation at the cross-sectional neck of the aneurysm. This observation may partially explain the hemodynamic causes of future recanalization after coil embolization.
PURPOSE: Hemodynamic factors are considered to play an important role in initiation and progression of the recurrence after endosaccular coiling of the intracranial aneurysms. We made paired virtual models of completely coiled aneurysms which were subsequently recanalized and compared to identify hemodynamic characteristics related to the recurred aneurysmal sac. MATERIALS AND METHODS: We created paired virtual models of computational fluid dynamics (CFD) in five aneurysms which were initially regarded as having achieved complete occlusion and then recurred during follow-up. Paired virtual models consisted of the CFD model of 3D rotational angiography obtained in the recurred aneurysm and the control model of the initial, parent artery after artificial removal of the coiled and recanalized aneurysm. Using the CFD analysis of the virtual model, we analyzed the hemodynamic characteristics on the neck of each aneurysm before and after its recurrence. RESULTS: High wall shear stress (WSS) was identified at the cross-sectionally identified aneurysm neck at which recurrence developed in all cases. A small vortex formation with relatively low velocity in front of the neck was also identified in four cases. The aneurysm recurrence locations corresponded to the location of high WSS and/or small vortex formation. CONCLUSION: Recanalized aneurysms revealed increased WSS and small vortex formation at the cross-sectional neck of the aneurysm. This observation may partially explain the hemodynamic causes of future recanalization after coil embolization.
Authors: S Gallas; A C Januel; A Pasco; J Drouineau; J Gabrillargues; A Gaston; C Cognard; D Herbreteau Journal: AJNR Am J Neuroradiol Date: 2009-08-13 Impact factor: 3.825
Authors: Y Funakoshi; H Imamura; S Tani; H Adachi; R Fukumitsu; T Sunohara; Y Omura; Y Matsui; N Sasaki; T Fukuda; R Akiyama; K Horiuchi; S Kajiura; M Shigeyasu; K Iihara; N Sakai Journal: AJNR Am J Neuroradiol Date: 2020-05-07 Impact factor: 3.825
Authors: Rafał Morga; Marek Moskała; Tadeusz Popiela; Marek Rajzer; Aleksander Wilk; Michał Kłosiński; Tomasz Muszyński; Mariusz Trystuła Journal: Med Sci Monit Date: 2020-03-31