Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Right Port - A - Cath ends at the mid SVC . Radiation changes in the mid to upper lung on the left in the perihilar region with retraction of the trachea . Mild tenting of the left hemidiaphragm also likely represents radiation changes . No pleural effusion or pneumothorax . A large mediastinal mass is stable from ___ . Moderate degenerative changes throughout the lower thoracic spine are unchanged .
    OUTPUT:
    
1 . Radiation changes in the mid to upper left lung in the perihilar region with retraction of the trachea are seen . Mild tenting of the left hemidiaphragm also likely represents radiation changes . 2 . A large mediastinal mass is stable from ___ .