Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is borderline enlarged . The mediastinal and hilar contours are unremarkable . Pulmonary vasculature is normal . Waxing and waning opacification is noted within the right upper lobe in a region of previous scarring , currently appearing worse in the interval . Left lung is clear . No pleural effusion or pneumothorax is present . No acute osseous abnormality is demonstrated .
    OUTPUT:
    
Waxing and waning opacification in the right upper lobe in a region of scarring , currently worse in the interval . This may reflect pneumonia in the correct clinical setting , but a recurrent chronic pneumonitis such as from cryptogenic organizing pneumonia may be present .