Maxim grew up and developed with some delay in motor development. The child was unable to run, jump, or climb stairs alone due to increased fatigue, but he developed dynamically with a slow increase in motor function. At the age of 5.5, Maxim's mother noticed a violation of her son's gait (pulling up one leg when walking). Then there were falls while walking, impaired coordination, and the formation of flexion of the fingers. The diagnosis of 'SMA' in 2016 has not been confirmed. In 2017, he was examined in Moscow, where the child was diagnosed with "neurodegenerative brain disease?". Next, Maxim was observed at BelMAPO, Department of Pediatric Neurology. The child's diagnosis is not accurate. For this reason, it is impossible to prescribe a suitable treatment. Two years ago, Maxim's situation with his hands began to deteriorate: he can squeeze them on his own, but he can hardly untwist them. Electroneuromyography on January 24, 2024 showed a gross lesion of the nerves of the upper and lower extremities. To clarify the nosological form of the disease, the preferred diagnostic method is complete genomic sequencing.