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14847 Pathology

A 60-year-old male, chronic smoker, presented with fatigue and chest pain. On examination, there was inset left eyeball with drooping upper left eyelid and reduced left pupil size. Which of the following is the most likely diagnosis in this condition?

ASquamous cell carcinoma involving the apex of his left lung (Correct Answer)
BAdenocarcinoma involving left mainstem bronchus
CA small-cell carcinoma involving the hilum of his left lung
DBronchioloalveolar carcinoma involving the left lower lobe