[Case of diagnostics of a rare form of glycogen disease].

Differential diagnosis of hypoglycemic syndrome remains an urgent problem in Pediatrics. In this article, a case of glycogen storage disease (BNG) type 0 is described in the boy, which is undoubtedly a rare pathology, which makes it difficult to diagnose this form of glycogenosis. In this description, the case of type 0 BNG is caused by a mutation in the GYS2 gene encoding the hepatic isoform of glycogen synthase. This form of the disease is usually asymptomatic in infancy. However, it can be suspected in the case when the refusal of night feeding causes certain difficulties due to the hungry ketotic hypoglycemia that occurs in the child. The first clinical symptoms appear in early childhood with the inclusion of a more varied diet in the child, increasing the intervals between meals. Symptoms of the disease are primarily caused by hypoglycemia. It should be noted that, despite the low levels of glycemia, most children do not have any mental development disorders, since the increase in the level of ketone bodies in the blood plasma provides the brain with an alternative source of energy.