Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild interval improvement in the previously noted small to moderate right pneumothorax with right pleural drainage catheter slightly repositioned . Lungs are otherwise clear . The cardiomediastinal silhouette is unchanged . No pleural effusion .
    OUTPUT:
    
Mild interval improvement in previously noted small to moderate right pneumothorax since ___ .