Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are slightly lower , particularly on the right . Left chest tube is unchanged . Left perihilar consolidation is increased since the prior study , likely reflecting atelectasis . Previous moderate left pleural effusion is smaller and the heterogeneous opacity at the left lung base is likely a combination of atelectasis and edema . Increasing opacities at the right lung base may reflect a developing pneumonia .
    OUTPUT:
    
Decrease in size of left pleural effusion , with bibasilar atelectasis , left greater than right , and slight decrease in lung volumes . Increasing opacities at the right lung base , while may reflect atelectasis , raise the concern for pneumonia . Continued surveillance is recommended .