MAPT and Parkinson disease: The clinical heterogeneity of PSP has been highlighted by the description of Richardson's syndrome (RS)4, 5 and other syndromes with identical pathology including PSP‐parkinsonism (PSP‐P) and PSP‐pure akinesia with gait freezing (PSP‐PGF),6, 7 which are included in recent Movement Disorder Society (MDS) diagnostic criteria.8 This heterogeneity is associated with common variation at the TRIM11 locus9 and variability in the regional distribution and density of pathogenic tau accumulation.10