CA4 and mild neurocognitive disorder: While overall lesions were sparse, we found greater burden of poly-GR inclusions in the FCtx of FTLD-MND compared to MND, and significantly more poly-GR inclusions in specific hippocampal subfields (i.e. CA2/3) of FTLD-MND compared to FTLD, as well as a trend for increases in CA4 of FTLD-MND compared to FTLD (Additional file 3: Table S1).