SLC6A3 and dementia: Dopamine transporter abnormalities have been consistently identified in iRBD.77,79–85 Interestingly, dopamine transporter abnormalities have been associated with more severe RBD symptoms and an accelerated rate of progression to dementia.86–88 However, very little is known about the interplay between 123I-FP-CIT SPECT and FDG PET findings in iRBD.