Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart is normal size and cardiomediastinal silhouette is stable . There is increased subtle hazy opacification in the left lower lung , best seen on the frontal view . Previously noted diffuse bilateral prominence of the interstitial markings has slightly improved . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Increased subtle hazy opacification in the left lower lung may represent early or developing pneumonia in the appropriate clinical context .