How many people are affected by frontotemporal dementia with parkinsonism-17 ?
The worldwide prevalence of FTDP-17 is unknown. In the Netherlands, where the disease prevalence has been studied, it is estimated to affect 1 in 1 million people. However, the disorder is likely underdiagnosed, so it may actually be more common than this.  FTDP-17 probably accounts for a small percentage of all cases of frontotemporal dementia.