Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . The hilar and mediastinal contours are within normal limits . Previously seen right upper and lower zone opacities mostly resolved , however trace opacities remain in these regions . No new opacities , pneumothorax , or pleural effusion is seen .
    OUTPUT:
    
Improved right lung pneumonia . Residual opacities at the right lung likely reflect some residual disease . A followup at four weeks is recommended to ensure resolution .