Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a right upper lobe opacity , similar to the PET CT from ___ , consistent with radiation changes or metastatic tumor spread . This is significantly progressed since ___ . The cardiomediastinal silhouette and hila are normal . No pleural effusion or pneumothorax .
    OUTPUT:
    
1 . No acute cardiothoracic process . 2 . Right upper lobe opacity likely due to radiation changes or metastatic tumor spread , unchanged since ___ .