Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Ill - defined opacity at the right lateral costophrenic angle is similar compared to prior chest x-rays , potentially due to scarring given persistence over time . Elsewhere , the lungs are clear . Cardiomediastinal silhouette is within normal limits . Coronary artery stents are noted . No acute osseous abnormalities identified .
    OUTPUT:
    
No acute cardiopulmonary process .