A case of acute Wernicke's encephalopathy induced by thiamine deficiency due to malnutrition subsequent to chemoradiotherapy for tongue cancer is presented. A 63-year-old male patient had severe oral mucositis and mental stress in a long-term hospitalization for chemoradiotherapy of tongue cancer. After discharge from hospital, he had alcoholism and malnutrition. Three months later, disturbance of consciousness and ataxia followed by memory disturbance appeared. Laboratory examination revealed low serum level of thiamine. The symptoms, laboratory data, and magnetic resonance imaging suggested acute Wernicke's encephalopathy. The patient was intravenously administered thiamine and received nutritional control, thereby the symptoms were improved.
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