MS-3642

A 68-year-old man visits his GP complaining of an 8-week cough and an unintentional weight loss of 7kg. He has a smoking history of 35 pack-years. The GP observes some alterations in his left eye, which are indicative of Horner’s syndrome.

The man is referred to the suspected cancer pathway and is subsequently diagnosed with a Pancoast tumour.

What symptom is this individual most likely to exhibit?