Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A new pigtail catheter has been placed and projects over the right hemithorax . There is a small residual right apical pneumothorax but markedly decreased . Irregularity along the superior margin of the right pleural surface suggests that a bleb may be the etiology , although a discrete bleb is not visualized . The lungs appear otherwise clear . There are no pleural effusions or pneumothorax . The cardiac , mediastinal and hilar contours appear unchanged .
    OUTPUT:
    
Small residual right apical pneumothorax , but markedly decreased following chest tube placement .