Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Persistent linear right upper lung opacity is again seen . Elsewhere , the lungs are hyperinflated but clear . There is no focal consolidation or effusion . Cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary process . Persistent nodular right upper lumbar opacity unchanged from multiple prior exams and is most likely due to scarring . Longer term followup to confirm stability could be considered , especially in light of suspected underlying emphysema .