Stronger Microstructural Damage Revealed in Multiple Sclerosis Lesions with Central Vein Sign by Quantitative Gradient Echo MRI

Abstract BackgroundMultiple sclerosis (MS) lesions typically form around a central vein that can be visualized with FLAIR* MRI, creating the central vein sign (CVS) which may reflect lesion pathophysiology. Herein we used Gradient Echo Plural Contrast Imaging (GEPCI) MRI to simultaneously visualize CVS and measure tissue damage in MS lesions. We examined CVS in relation to tissue integrity in white matter (WM) lesions and among MS subtypes. Subjects and MethodsThirty relapsing–remitting MS (RRMS) subjects and 38 progressive MS (PMS) subjects were scanned with GEPCI protocol. GEPCI T2*-SWI images were generated to visualize CVS. Two investigators independently evaluated WM lesions for CVS and measured lesion volumes. To estimate tissue damage severity, total lesion volume, mean lesion volume, R2t*-based tissue damage score (TDS) of individual lesions and tissue damage load (TDL) were measured for CVS+, CVS-, and confluent lesions. Spearman correlations were made between MRI and clinical data. A paired t-test was used to compare measurements of CVS+ versus CVS- lesions in each individual. Results398 of 548 lesions meeting inclusion criteria showed CVS. Most patients had ≥ 40% CVS+ lesions. CVS+ lesions were present in similar proportion among MS subtypes. Interobserver agreement was high for CVS detection. CVS+ and confluent lesions had higher average and total volumes versus CVS- lesions. CVS+ and confluent lesions had more tissue damage than CVS- lesions based on TDL and mean TDS. ConclusionCVS occurred in RRMS and PMS in similar proportions. CVS+ lesions had greater tissue damage and larger size than CVS- lesions.