MSRA-1598

A 45-year-old man presents to the Vascular Clinic. He has been found to have a left internal carotid dissection incidentally while having cross-sectional neck imaging. He is asymptomatic, there are no intracranial or extracranial haematomas and he has not had a stroke or transient ischaemic attack in the past.
Which of the following is the most appropriate next step for this patient?