A 60-year-old man with a past history of smoking for 30 years (he stopped 3 years ago, prior to cardiac bypass surgery) is admitted with cough and mild hemoptysis. He is afebrile with no shoness on breath. Physical exam is negative except that the lung exam reveals rhonchi in the left upper lung zone. The finding/abnormality most likely to occur with the lesion seen on the CXR in