Ksenia has the consequences of early organ damage to the central nervous system with atonic-astatic syndrome, which is a pronounced violation of psychophysiological development. The development of children is impeded by the violation of the formation of motor and cognitive skills. Hyperkineticism occurs in the second year of life. Initially, they were regarded as epileptic seizures, but the prescribed and ongoing therapy did not bring any effect. It was cancelled. The hereditary history is not burdensome. The brain MRI did not reveal any pathologies. In order to select a treatment, the girl has already undergone a genetic examination in Belarus, which made it possible to exclude microdeletion syndromes. To select the optimal treatment tactics for Ksenia's needs in a genetic study. The girl was supported by «Chance» program.