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REM sleep behavior disorder (RBD) may occur years before the onset of cognitive and motor symptoms in Parkinson disease (PD), multiple system atrophy (MSA), or dementia with Lewy bodies (DLB). Researchers conducted this prospective cohort study to determine whether brain metabolic patterns could be distinguished among healthy controls, patients with polysomnography-confirmed idiopathic RBD (iRBD), Parkinson disease patients with a pre-morbid history of RBD based on validated questionnaires (PD-RBD), and treated Parkinson disease (PD) patients. Resting 18 F-fluorodeoxyglucose positron emission tomography (FDG-PET) patterns were derived from those with PD-RBD (PDRBD pattern) and those with treated PD (PD pattern). Patients also underwent olfa…