An adult case of acute encephalopathy associated with general anaesthesia and the m.11232T>C MT-ND4 variant.

We report the case of a 20-year-old woman who developed acute encephalopathy after uneventful general anaesthesia with sevoflurane, propofol, and opioids. The patient presented neurological impairment followed by metabolic acidosis and hyperlactatemia and neuroimaging findings involving the basal ganglia, brainstem, and cerebellum. Genetic testing confirmed the mitochondrial variant m.11232T>C in the MT-ND4 gene, previously described only in paediatric patients. This case could be one of the first cases described in the literature of acute encephalopathy associated with this mutation in an adult patient, possibly precipitated by exposure to volatile anesthetics. The patient's favorable clinical and radiological evolution after intensive neuroprotective management and suboccipital decompressive craniectomy highlights the importance of early diagnosis and individualized treatment. Mitochondrial dysfunction should be considered in atypical neurological presentations following general anesthesia, especially when accompanied by lactic acidosis and unusual neuroimaging findings.