Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiograph demonstrate stable prominence of the upper mediastinum , particularly on the left with evidence of volume loss and traction of the hila , particularly on the left consistent with fibrosis related to radiotherapy , not significantly changed since ___ . No new nodular contour abnormality to suggest underlying lymphadenopathy . Lungs are clear . No pleural effusion or pneumothorax .
    OUTPUT:
    
Stable post-radiation treatment change . No evidence of lymphadenopathy or lung mass .