18th August 2020

A 45-year-old woman is brought to A&E by ambulance

A 45-year-old woman is brought to A&E by ambulance. Her husband rang an ambulance as she had become confused and drowsy, and was complaining of feeling unwell. She has a past medical history of epilepsy and has been seizure-free on medication for over three years. On examination, she is ataxic and has widespread clinically-significant nystagmus.

Which of the following is the most likely cause of this patient’s presentation?

Select the SINGLE most appropriate option from the list below. Select ONE option only.