Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable frontal chest radiograph demonstrates improving right lower lobe opacification with persistent retrocardiac left lower lobe opacification , likely atelectasis . There is no overt pleural effusion . The lungs overall appear better aerated . The cardiomediastinal and hilar contours are stable in appearance . Mild pulmonary vascular congestion , improved since prior .
    OUTPUT:
    
Better aerated lungs with improving right lower lobe opacification . Improved mild pulmonary edema .