Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged . There is greater opacification of the left lower lobe , although a pleural effusion in the left lung is probably similar in size . Increased opacification is suspected to primarily reflect increase in associated atelectasis extending posteriorly from the left hilum . There is no right - sided pleural effusion . There is no pneumothorax .
    OUTPUT:
    
Similar moderate left - sided pleural effusion with greater left lower lobe opacification which probably consists mostly of increasing associated atelectasis , although areas of loculated fluid are difficult to completely exclude .