While α‐synuclein Lewy body cortical involvement may not always predict dementia [60], it is worthwhile noting that at least one‐third of LRRK2 carriers do not have evidence of α‐synuclein seeding in the CSF [9] and do not show CNS Lewy bodies at autopsy [61, 62] which suggests a restricted neurodegenerative process that is independent of α‐synuclein and slower progressing [15, 63, 64, 65, 66]. Here, LRRK2 is linked to dementia.