[The possibilities of differential diagnosis of primary progressive aphasia].

The authors describe a clinical case demonstrating the difficulties of diagnosing primary progressive aphasia, the need for a differential diagnosis with a logopenic variant of Alzheimer's disease. The data of a clinical, neuropsychological study with a detailed instrumental and diagnostic search, including data from cerebrospinal fluid, positron emission tomography-CT, MRI, electroencephalography with cognitive loads, are presented. The article focuses on the widespread use of various diagnostic scales based on the international diagnostic criteria.