Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged . Opacity in the right upper lung appears similar to slightly increased while opacities in the left lower lung have partly resolved . Elsewhere the lungs remain clear without new areas of opacification . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Persistent , similar to slightly increased , opacity in the right upper lung suggesting acute infection , although otherwise improved .