Primary progressive aphasia (PPA) affects a person's ability to use language to communicate. This includes loss of ability to understand or express speech (aphasia). PPA is a specific type of a more general disease called frontotemporal dementia. PPA can be classified into three distinct types: progressive non-fluent aphasia (PNFA), semantic dementia (SD), and logopenic progressive aphasia (LPA). PPA is caused by a loss of tissue (atrophy) in the area of the brain that is responsible for producing language. In some cases, this loss of tissue is caused by genetic changes (genetic changes or pathogenic variants) in the GRN gene. In these cases, the disease is inherited in an autosomal dominant manner. Diagnosis of PPA is suspected when a doctor observes signs and symptoms such as progressive loss of language abilities. Imaging of the brain can confirm the diagnosis.