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A 69-year-old man presented to the emergency department after being found unconscious by his son. He had experienced headache the previous day but had been otherwise well. Investigations revealed a severe metabolic acidosis, raised lactate and acute kidney injury. The calculated anion and osmolar gap were both elevated at 37.7 and 39.3, respectively. Due to his reduced Glasgow coma score (GCS) he was intubated and a CT scan performed: only a small, mature pontine infarct was found of uncertain significance. Further questioning of the family revealed accidental ingestion of 150 ml of a ‘blue liquid’ 24 h earlier (later identified as car screenwash). With ethylene glycol (EG) poisoning suspected, he was given intravenous ethanol, fomepizole (a competitive inhibitor of alcohol dehydrogenase) and haemofiltration. Despite the delayed presentation, prompt recognition and treatment of EG poisoning led to a successful discharge in this case.