MRCP2-4215

A 65-year-old man presents with symptoms of weight gain and purplish stripes on his abdomen, along with a history of community-acquired pneumonia. His recent chest x-ray shows resolution of the pneumonia but a suspicious right hilar mass. He has a 40 pack-year smoking history and has been diagnosed with hypertension and borderline diabetes. What type of lung cancer is most likely in this patient?