Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: In comparison to the prior radiograph , the left lower lobe opacities have perhaps slightly improved suggesting that this is due to atelectasis rather than pneumonia . The remainder of the exam remains unchanged with a right - sided PICC terminating in the upper SVC . The cardiac silhouette is normal in size . No pleural effusion . No pneumothorax .
    OUTPUT:
    
Left lower lobe atelectasis , perhaps slightly improved from prior . No other relevant change identified .