Limbic Structural Alterations and Structural Covariance Across Prodromal Phenotypes and Early Parkinson's Disease.
This retrospective cross-sectional study investigated limbic structural alterations across prodromal PD phenotypes defined by rapid eye movement sleep behavior disorder (RBD) and/or hyposmia to reveal phenotype-specific significant covariance patterns involving olfactory-related and Papez circuit regions.