Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Linear opacities in the bilateral lung bases likely represent scarring , as they are similar in appearance since at least ___ . The lungs are otherwise well aerated without evidence of focal consolidation , pleural effusion , or pneumothorax . Cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
No focal consolidation concerning for pneumonia . Stable bibasilar scarring .