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Background and Purpose:  This study aimed to assess the effect of baseline white matter hyperintensities (WMH) on 1-year stroke recurrence and the functional outcome for patients with intracranial atherosclerosis (ICAS).   Methods:  We analyzed 2,076 patients who were enrolled in the Chinese IntraCranial AtheroSclerosis (CICAS) study. ICAS and WMH were diagnosed by baseline magnetic resonance angiography. The primary outcomes were stroke recurrence and unfavorable functional outcome (modified Rankin Scale score 3–6) at 1 year.   Results:  Of the 2,076 patients included in this study, 1,370 (65.99%) were men, and the mean age was 61.70 years. In total, 224 (10.79%) patients had no WMH and no ICAS, 922 (44.41%) patients had WMH and no ICAS, 157 (7.56%) patients had ICAS and no WMH, and 773 (37.24%) had both WMH and ICAS. During the follow-up period, 87 patients had a recurrent stroke and 333 had unfavorable outcomes at 1 year. Compared to WMH (–) ICAS (–) group, the adjusted odd ratios and 95% confidence interval for unfavorable functional outcome were 0.791 (0.470–1.332;  p  = 0.3779) in the WMH (+) ICAS (–) group, 1.920 (1.024–3.600;  p  = 0.0421) in the WMH (–) ICAS (+) group, and 2.046 (1.230–3.403;  p  = 0.0058) in the WMH (+) ICAS (+) group. There was no significant difference in stroke recurrence risk among the four groups.   Conclusion:  ICAS coexisting with WMH may predict an unfavorable functional outcome at 1 year, but not stroke recurrence.

frontiers in neurology

Intracranial Atherosclerosis Coexisting With White Matter Hyperintensities May Predict Unfavorable Functional Outcome in Patients With Acute Cerebral Ischemia