Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal lateral chest radiographs demonstrate a normal cardiomediastinal silhouette and well - aerated lungs . There has been interval improvement in the right lower lung opacity , with residual linear opacity representing either residual pneumonia or atelectasis . The retrocardiac opacity again could represent a small hiatal hernia . No new focal consolidation , pleural effusion , or pneumothorax is seen . The visualized upper abdomen is unremarkable .
    OUTPUT:
    
Interval improvement in the right lower lung pneumonia , with only a small residual right lower lung opacity .