Co-Existence of tau and α-synuclein pathology in fetal graft tissue at autopsy: A case report.

•Both a-synuclein and tau pathology in fetal transplanted tissue in a Parkinson's disease patient.•One theory is that α-synuclein and tau pathology spread from host to graft in a neuron-neuron manner.•Alternatively host environment could cause native graft proteins to become phosphorylated.