Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart remains moderately enlarged . The mediastinal and hilar contours are stable . The pulmonary vascularity is not engorged . Patchy opacities within the lung bases may reflect atelectasis . There is likely a trace left pleural effusion , but this has decreased compared to the prior study . Previously noted small right pleural effusion is not clearly demonstrated on the current exam . No pneumothorax is definitively noted . There are no acute osseous abnormalities .
    OUTPUT:
    
Bibasilar patchy opacities which may reflect atelectasis . Possible small left trace pleural effusion .