Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patchy opacity at the right base . Linear opacities in the right upper lung are due to scarring . The lung are hyperinflated likely due to emphysema . Dense opacities overlying the aortopulmonary window which may represent calcified lymph nodes related to prior granulomatous infection . No pleural effusion or pneumothorax . The cardiac silhouette is enlarged . The aortic knob is calcified .
    OUTPUT:
    
Patchy opacity at the right base may represent infection or aspiration , less likely asymmetric pulmonary edema . Comparison to prior films would be helpful .