Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal semi-upright chest radiograph demonstrates stable prominent interstitial markings and known post-radiation paramediastinal fibrosis particularly evident in the left upper lung . Mediastinal and hilar contours are unchanged . There is stable cardiac enlargement which may represent cardiomegaly , although pericardial effusion should also be considered . No pleural effusion or pneumothorax identified .
    OUTPUT:
    
No acute changes . Stable interstitial lung disease and cardiac enlargement .