Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The linear opacities in the right mid and left mid lung appear to change or resolve on a repeat film and are compatible with atelectasis . The lungs are otherwise clear and well expanded . Mild cardiomegaly is unchanged . The mediastinal silhouette and hilar contours are normal . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
1 . Mild bilateral atelectasis in the mid lung but no evidence of pneumonia . 2 . Mild cardiomegaly unchanged since ___ .