A 51-year-old man presented to our emergency department with persistent right cervical pain. Neurologic examination was unremarkable, and no anisocoria was reported. Using a linear ultrasound probe, the pupillary diameters… Click to show full abstract
A 51-year-old man presented to our emergency department with persistent right cervical pain. Neurologic examination was unremarkable, and no anisocoria was reported. Using a linear ultrasound probe, the pupillary diameters were measured at rest, under direct/consensual light stimulus, and after elicitation of the ipsilateral ciliospinal reflex (CR), evoked by applying a painful stimulation (pinching) at the base of the neck on the trapezius muscle.1,2
               
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