Demographic features, clinical signs and ratings, FP-CIT uptake measures and additional neuroimaging investigations in the 4 CBS patients with normal FP-CIT measures.

We additionally reported 3 CBS cases with normal FP-CIT uptake in the caudate nucleus and the putamen bilaterally, but included in the CBSP subgroup because of abnormal asymmetry indices and/or caudate-to-putamen ratio (cases 5, 6 and 7). + = sign present; (+) = initial sign; − = sign absent.