Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left lower lung opacity which is a combination of small left pleural effusion and left lung base atelectasis is minimally worse since ___ . Mild pulmonary vascular congestion has improved . Right lung base atelectasis has resolved . There are no lung opacities concerning for pneumonia . Top normal heart size , mediastinal and hilar contours are unremarkable .
    OUTPUT:
    
Left lower lung opacity is likely combination of small effusion and left lower lung atelectasis , worse since ___ . No opacities concerning for pneumonia .