Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A large right perihilar opacity is new since the PET CT on ___ . Additional inferhilar opacities and fidicual seed appear stable , taking into account the different study modalities . No opacities concerning for an infectious process are seen . No pleural effusion or pneumothorax is identified . Mediastinal clips at the patient 's prior sites of surgeries are again present .
    OUTPUT:
    
Right perihilar opacity consistent with radiation changes .