Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . Mediastinal and hilar contours are unchanged . The known mediastinal lymphadenopathy and left hilar mass are better assessed on the previous PET - CT . Pulmonary vasculature is normal . Lungs are clear . No pleural effusion or pneumothorax is seen . Moderate degenerative changes are noted in the thoracic spine . No subdiaphragmatic free air is present .
    OUTPUT:
    
No acute cardiopulmonary abnormality . No subdiaphragmatic free air . Known mediastinal lymphadenopathy and left hilar mass , better assessed on previous PET - CT .