Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bilateral lung opacities with upper lobe predominance has slightly worsened and has fluctuated overtime since a few days . This is probably pulmonary edema considering its rapid evolution ; however , it is unusual that the lower lungs are spared . Left lower lobe atelectasis has resolved . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
Slight worsening of moderate pulmonary edema .