Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to the prior chest CT of ___ a small left pleural effusion and left lower lobe atelectasis has slightly decreased in size . There is no significant right pleural effusion . Bilateral linear opacities most likely represent atelectasis . There is no new consolidation or focal opacity concerning for infection . The cardiac contour is stable . No pneumothorax is identified .
    OUTPUT:
    
Slightly decreased left pleural effusion and left lower lobe atelectasis since ___ . No new opacity concerning for infection .