In vivo coupling of dendritic complexity with presynaptic density in primary tauopathies

•Dendritic complexity and presynaptic density are reduced in the 4R-tauopathies of PSP and CBD.•The reduction in ODI and UCB-J binding is coupled across the cortical mantle as well as subcortically.•The relationship between ODI and UCB-J binding is not attributed to atrophy.•ODI may be a useful biom...

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