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CT brain study.
No evidence of sulcal effacement, acute haemorrhage or ischaemic changes within the brain. Ventricular pattern is appropriate for age. No acute fractures seen.
The cervical segment of the left internal carotid artery demonstrates a narrowed lumen with a crescent-shaped hyperattenuating focus, favoured to be a mural thrombus that extends towards the skull base. This is suspicious for acute left internal carotid artery dissection, especially given the presenting history.