Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is no residual pneumothorax . There is stable volume loss in the left hemithorax . Irregular density in the perihilar region consistent with known malignancy . There is no CHF . Postoperative cervical spine surgery hardware is present .
    OUTPUT:
    
There is no residual pneumothorax . There is stable perihilar density on the right .