Özet:

Vitamin B12 is one of the essential vitamins that affects various systems in the body. Vitamin B12 deficiency can be seen at any age. During infancy, hematological and neurological disorders, including macrositer anemia, neurodevelopmental delay or regression, irritability, weakness, hypotonia, ataxia, apathy, tremor and seizures are caused. Vitamin B12 deficiency in patients with different nonspecific neurological findings should be considered in differential diagnosis. In this article, we present a case of lethargic girl who was referred for eleven months of sleep and awakening. Vitamin B12 levels were found to be low due to the presence of a finding compatible with macrositer anemia in the whole blood count and peripheral spread of the case and because of the backwardness in the neuro motor developmental stages. Following the first dose with Vitamin B12 treatment, the clinical presentation began to improve and the findings disappeared completely over time.