Wall enhancement on black-blood MRI is independently associated with symptomatic status of unruptured intracranial saccular aneurysm.

Abstract

This study aims to investigate whether aneurysm wall enhancement (AWE) is independently associated with symptomatic status of unruptured intracranial aneurysms (UIAs). One hundred thirty-nine consecutive patients (67 male, mean age 58 ± 11years) with 79 symptomatic and 87 asymptomatic UIAs were imaged using black-blood MRI pre- and post-gadolinium contrast administration and 3D DSA. Symptoms related to aneurysms were identified including cranial nerve deficits and headache. AWE grade and area were characterized, and aneurysm size was measured on DSA. Multivariate binary logistic regression analysis was used to identify factors associated with symptoms. Further subgroup analysis was performed for aneurysms size < 10mm. Symptomatic UIAs had significantly larger aneurysm size (11.2 ± 6.2mm vs. 6.4 ± 3.3mm), enhancement grade (1.3 ± 0.6 vs. 0.4 ± 0.6), enhancement area (2.0 ± 0.9 vs. 0.4 ± 0.7), and higher prevalence of thick enhancement (39% vs. 3%) compared with asymptomatic UIAs, all p < 0.001. In multivariate analysis, only AWE area (odds ratio [OR] 6.9, 95% confidence interval [4.0, 11.7]) was independently associated with symptoms. AWE area had an area under curve (AUC) value of 0.888, with 72.2% sensitivity and 92.0% specificity for symptoms, which was superior to aneurysm size (AUC of 0.771, with 75.9% sensitivity and 65.5% specificity). In the subgroup analysis of aneurysms smaller than 10mm (n = 118), AWE area (OR, 7.0, p < 0.001) remained the only independent risk factor associated with symptoms. Larger AWE area is independently associated with symptomatic UIAs, which may provide additional value to guide UIA management and improve patient outcomes. • Symptomatic intracranial aneurysms are larger and more often demonstrate significant wall enhancement than asymptomatic aneurysms. • Larger wall enhancement area is independently associated with symptomatic intracranial aneurysm.