30th September 2020

A 30-year-old female presents with blurry vision

A 30-year-old female presents with blurry vision. She also complains of a one-week episode of right arm weakness previously which resolved spontaneously. You notice that her right pupil dilates when you swing a pen torchlight from the left to the right eye. 

Which of the following is the most likely underlying diagnosis?

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