13th June 2023

A 40-year-old woman is admitted to the stroke unit with sudden onset of right-sided weakness and neglect

A 40-year-old woman is admitted to the stroke unit with sudden onset of right-sided weakness and neglect. Her only past medical history is mild asthma and three miscarriages, all at less than twenty weeks’ gestation. She is under investigation by rheumatology for intermittent joint pains. Her CT brain shows signs of a left MCA infarct.

Which of the following investigations is most likely to give the underlying cause for her presentation?