[Wernicke's encephalopathy associated with pellagra encephalopathy: rare and unusual complication in an elderly woman hospitalized for aspiration pneumonia]. / Encéphalopathie de Gayet Wernicke associée à une encéphalopathie pellagrique : complication rare et inhabituelle chez une femme âgée hospitalisée pour pneumopathie d'inhalation.

INTRODUCTION: Wernicke's encephalopathy caused by thiamine deficiency is typically characterised by a mental-status change, oculomotor dysfunction and an ataxia. Pellagra is the clinical presentation of niacin deficiency comprising cutaneous, gastrointestinal and neuropsychiatric manifestations. OBSERVATION: We report a case of encephalopathy due to dual vitamin deficiency of both thiamine (vitamin B1) and niacin (vitamin PP) in an 80-year-old women, hospitalized for severe sepsis caused by aspiration pneumonia. Severe malnutrition and alcohol consumption pointed to a diagnosis of vitamin deficiency. The clinical presentation and magnetic resonance imaging (MRI) were compatible with Wernicke's encephalopathy that remained irreversible despite vitamin B1 supplementation. Niacin supplementation allowed for complete regression of the observed symptoms compatible with niacin deficiency. CONCLUSION: Malnourished and alcoholic patients showing signs of encephalopathy should receive supplemental multivitamins including niacin.