To the Editor: We report the case of a 71-year-old woman who presented with a 3-week history of lethargy, subacute confusion and drowsiness. She was known to have a seizure disorder for which she had been taking lamotrigine 100 mg and sodium valproate 500 mg twice a day for 2 years.
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We thank Professor Peter Roberts-Thomson, Director of the Department of Immunology at Flinders Medical Centre, for his expert opinion and advice.