RT Journal Article SR Electronic T1 Associations between haemodynamics and wall enhancement of intracranial aneurysm JF Stroke and Vascular Neurology JO Stroke Vasc Neurol FD BMJ Publishing Group Ltd SP 467 OP 475 DO 10.1136/svn-2020-000636 VO 6 IS 3 A1 Miaoqi Zhang A1 Fei Peng A1 Xin Tong A1 Xin Feng A1 Yunduo Li A1 Huijun Chen A1 Hao Niu A1 Baorui Zhang A1 Guangrong Song A1 Youxiang Li A1 Peng Liu A1 Aihua Liu A1 Rui Li YR 2021 UL http://svn.bmj.com/content/6/3/467.abstract AB Background and purpose Previous studies have reported about inflammation processes (IPs) that play important roles in aneurysm formation and rupture, which could be driven by blood flow. IPs can be identified using aneurysmal wall enhancement (AWE) on high-resolution black-blood MRI (BB-MRI) and blood flow haemodynamics can be demonstrated by four-dimensional-flow MRI (4D-flow MRI). Thus, this study investigated the associations between AWE and haemodynamics in unruptured intracranial aneurysms (IA) by combining 4D-flow MRI and high-resolution BB-MRI.Materials and methods Between April 2014 and October 2017, 48 patients with 49 unruptured IA who underwent both 4D-flow MRI and high-resolution BB-MRI were retrospectively included in this study. The haemodynamic parameters demonstrated using 4D-flow MRI were compared between different AWE patterns using the Kruskal-Wallis test and ordinal regression.Results The results of Kruskal-Wallis test showed that the average wall shear stress in the IA (WSSavg-IA), maximum through-plane velocity in the adjacent parent artery, inflow jet patterns and the average vorticity in IA (vorticityavg-IA) were significantly associated with the AWE patterns. Ordinal regression analysis identified WSSavg-IA (p=0.002) and vorticityavg-IA (p=0.033) as independent predictors of AWE patterns.Conclusion A low WSS and low average vorticity were independently associated with a high AWE grade for IAs larger than 4 mm. Therefore, WSS and average vorticity could predict AWE and circumferential AWE.Data are available upon reasonable request. Anonymized data will be shared by request from any qualified investigator.