NEFL and movement disorder: Subsuming all movement disorders with nigrostriatal degeneration, positive correlations between NfL levels and nearly every striatal regions were found except the left nucleus caudatus showing a trend (r = 0.520, p = 0.069), (putamen right, r = 0.565, p < 0.05; nucleus caudatus right, r = 0.663, p < 0.05, and putamen left, r = 0.583, p < 0.05).