7th June 2023

A 60-year-old woman is seen in the stroke clinic, having had a posterior circulation stroke six weeks earlier

A 60-year-old woman is seen in the stroke clinic, having had a posterior circulation stroke six weeks earlier. She has no past medical history other than her recent stroke. She is a lifelong non-smoker and drinks minimal alcohol. Her bloods from her hospital admission include normal cholesterol levels and ECG that showed that she was in sinus rhythm.

Which of the following would be an appropriate next investigation to find the cause of her stroke?