Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear of focal consolidation worrisome for pneumonia . On the lateral view , there are linear opacities in the retrosternal clear space which likely localize to the left lung which demonstrates fibrotic changes laterally on the frontal exam , unchanged dating back to ___ . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormality is identified .
    OUTPUT:
    
No acute cardiopulmonary process .