Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The previously noted spiculated lesion / scar in the right lower lung zone shows interval decrease in size . Associated right - sided effusion or pleural thickening . Adjacent right middle and lower lobe atelectatic changes . The cardiomediastinal shadow is normal . The left lung is clear .
    OUTPUT:
    
Interval decrease in size of the spiculated nodule / postsurgical changes in the right lower lung zone . Associated right - sided pleural effusion or pleural thickening : A decubitus film may be performed to differentiate between these .