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Background Rapid eye movement sleep behavior disorder(RBD)is a common sleep disorder in Parkinsons disease(PD)patients,which is characterized by complex limb or body movements associated with dream content and a loss of normal muscle atonia during REM sleep.The aims of this study were to wonder whether the presence of RBD would be reflected in the expansion of PD lesions and confirm the clinical features of RBD in Chinese PD patients.