Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are hyperexpanded with increased opacification of the right upper and middle lobes with silhouetting of the right cardiac border and retrocardiac opacification on lateral view suggests pneumonia . The mediastinal silhouette and bilateral hemidiaphragms stable . The left lung is clear . No pneumothorax or pleural effusion is present .
    OUTPUT:
    
Retrocardiac opacification concerning for pneumonia . Repeat radiograph 6 weeks after completion of treatment is recommended to ensure resolution .