Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are slightly low . There is persistent atelectasis in the left mid lung . Left lower lobe opacities are not significantly changed . There is mild increase in pulmonary edema . Moderate cardiomegaly is unchanged . There may be a small left pleural effusion . There is no pneumothorax .
    OUTPUT:
    
1 . Mild pulmonary edema has slightly worsened . 2 . Left lower lobe opacities which may reflect pneumonia and / or atelectasis are not significantly changed . 3 . Atelectasis in the left midlung is unchanged .