Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Pigtail chest tube projects over the right apex . Right pneumothorax has improved with only a trace apical component seen . Heart size is normal . Cardiomediastinal silhouette and hilar contours are normal . Lungs are clear except for left apical scarring at site of previous bullectomy . Pleural surfaces are clear without effusion .
    OUTPUT:
    
Interval decrease in size of right pneumothorax with only trace residual apical pneumothorax .