Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient status post a left upper lobectomy which has resulted in volume loss of the left hemithorax and shift of the mediastinum to the left . A left chest tube is in place and left side chest wall subcutaneous air is not unexpected . There is a small left apical pneumothorax . Clips are seen at the mediastinum . There is no pleural effusion or focal airspace consolidation worrisome for pneumonia . The right lung is clear . Heart is normal size . The aorta is mildly calcified but unchanged .
    OUTPUT:
    
Small left pneumothorax after left upper lobectomy .