In particular, the progressive protein deposition of alpha‐synuclein or tau in the brain may cause a number of different parkinsonism syndromes.1, 2 The most common subtype of parkinsonism is Parkinson's disease (PD), with an incidence rate of 14.2 per 100,000 person‐years.3 However, the presence of a significant degeneration is not always needed to cause parkinsonism. This evidence concerns the gene MAPT and Parkinson disease.