mrcem2-1851

mrcem2-1851

You evaluate a 47-year-old man with a history of increasing shortness of breath and a persistent dry cough. He has a smoking history of 25 pack-years.
The recent lung function test findings are as follows:
FEV1/FVC ratio = 85% predicted
FVC = 60% predicted
What is the MOST LIKELY diagnosis in this case?