Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs relatively hyperinflated . Slight increase in interstitial markings diffusely bilaterally suggest mild interstitial edema . No lobar consolidation is seen . There is no pleural effusion or pneumothorax . The cardiac silhouette is top - normal to mildly enlarged . Mediastinal contours are unremarkable . The aortic knob is calcified .
    OUTPUT:
    
Top - normal to mild enlargement of the cardiac silhouette . Mild interstitial edema .