Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mild to moderately enlarged . The aortic arch is partly calcified . The mediastinal and hilar contours are otherwise unremarkable . There is no cephalization of pulmonary vascularity . Upper lung fields appear clear . There is a fine reticular abnormality which is fairly widespread in both visualized lower lobes and suggestive of a more chronic abnormality such as underlying interstitial lung disease or extensive scarring . An acute abnormality is felt more likely . Correlation to prior films could be helpful , if clinically indicated , to investigate further .
    OUTPUT:
    
Reticulation in the lower lungs , probably chronic and suggestive of scarring or interstitial lung disease . If available , correlation with prior radiographs may be helpful if clinically indicated .