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Vitamin B12 deficiency anaemia in adults is usually caused by Addison- Biermer's disease. The presence of antibodies against gastric parietal cells and intrinsic factor (IF) in blood is typical for the disease. The gastrointestinal malabsorption or a diet poor in vitamin B12 are rarer causes. The disease manifests in hematological, neurological, psychiatric disorders and trophic changes of the tongue and oral mucosa, which leads to weight loss. The authors describe a case of a 70-year-old woman with severe vitamin B12 deficiency based o
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