A 70-year-old male smoker is seen in the clinic with symptoms of cough and sputum production. He is afebrile. On lung exam, there are leftsided crackles and rhonchi with egophony in the LUL. The patient is treated for acute exacerbation of chronic bronchitis. Sputum is negative for AFB. The changes on the patient's CXR on the left side are due to