MSFinals-3949

A 78-year-old man with a history of metastatic lung cancer presents to the oncology clinic for follow-up. Despite multiple rounds of radiotherapy, there has been no improvement in his condition and he is now receiving palliative care. During the visit, he mentions that his daughter has noticed a change in his facial appearance. Upon examination, the physician observes drooping of the right eyelid and a smaller right pupil. What other symptom is indicative of Horner’s syndrome?