Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Enlarged left upper lobe opacities correspond to a known mass . Mild aeration and mild edema of the left lower lung appears unchanged since the 9 : 56 a .m . examination from today . The right lung remains well aerated . There is no pneumothorax .
    OUTPUT:
    
Mild aeration and edema of the left lung is unchanged since the 9 : 56 a .m . examination .