A 50 year old man has had hoarseness of voice and drooping eyelid for 2 months. a mass is palpable in the right supraclavicular fossa. He smokes 20 cigarettes/day for the last 30yrs. What is the most likely diagnosis?

The key is E. Pancoast tumour. [Hoarseness of voice is due to compression of the recurrent laryngeal nerve, ptosis due to compression of the sympathetic ganglion, palpable mass in right supraclavicular fossa due to involvement of the supraclavicular lymph node. History of smoking and given picture indicates the diagnosis of Pancoast tumour].