A 73-year-old Caucasian male presents to the clinic for a ch…
A 73-year-old Caucasian male presents to the clinic for a checkup. He complains of dyspnea and a chronic nonproductive cough of several months duration for the last 3 years. On exam, he is thin, with a barrel-shaped chest, and he sits hunched forward with his hands on his knees breathing through pursed lips. He confirms that he is a smoker. What is your diagnosis?