The correlation between spasm severity and the ReHo values in brainstem, as well as MFG in the HFS groups.

<p><b>A.</b> the ReHo value in brainstem is positively correlates with spasm severity in the HFS group (r = 0.404, <i>p</i> = 0.027). <b>B.</b> the ReHo value in MFG is inversely correlates with spasm severity (r = -0.398, <i>p</i> = 0.028). HFS: hemifacial spasm MFG: middle frontal gyrus.