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A 49-year-old woman presented to the Emergency Department (ED) with left upper eyelid ptosis and pupil constriction: ocular signs of Horner's syndrome (figure 1, panel A). She described a 10-day history of ipsilateral neck pain and hemicranial headache, with no history of trauma. Diagnosis of Horner's syndrome was confirmed by instilling one drop of …
Competing interests None.
Patient consent Obtained.
Provenance and peer review Not commissioned; not externally peer reviewed.
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