Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The small right apical pneumothorax is unchanged after removal of the chest tube . There is volume loss in the right lung , compatible with right lower lobe segmentectomy . Opacification of the medial right lung base likely represents atelectasis or collapse of the remaining right middle lobe . There may be a small right pleural effusion . The left lung is clear . There is no pulmonary edema .
    OUTPUT:
    
1 . Unchanged small right apical pneumothorax . 2 . Atelectasis or collapse of the right middle lobe .