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A 62-year-old woman had noticed a droopy right eyelid for 2 weeks. She had a history of stage 2 breast cancer, treated 10 years before with mastectomy, radiotherapy and chemotherapy. She was otherwise healthy and took no medications. On examination, there was mild right upper eyelid ptosis and anisocoria, more pronounced in the dark, with the right pupil smaller than the left. Testing with 0.5% apraclonidine drops reversed the anisocoria (figure 1), and we diagnosed a right Horner’s syndrome.
On further questioning, she reported a recent onset of pain along the right lower ribs. Given the previous history of breast cancer, we obtained a dedicated MR scan of the cervical and …
Contributors All authors contributed equally to the writing/revision of the manuscript and obtaining the data for the manuscript.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Patient consent for publication Obtained.
Provenance and peer review Not commissioned; externally peer reviewed by Luke Bennetto, Bristol, UK.