Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Right hilar and perihilar opacification appears unchanged and suggests a site of treated malignancy . The cardiac , mediastinal and hilar contours appear unchanged . The lungs appear otherwise clear . There are no pleural effusions or pneumothorax .
    OUTPUT:
    
Stable appearance of the chest ; no evidence of a superimposed acute process .