Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: When compared to prior , there has been no definite interval change . Linear opacity in the right midlung is again seen as well as linear bibasilar opacities . These may be chronic and due to scarring given persistence over time . Although , there is subtle increased opacity projecting at the right lung base which could represent a superimposed process . Superiorly , the lungs are clear . The cardiomediastinal silhouette is within normal limits . Surgical clips project identified in the upper abdomen . No acute osseous abnormalities .
    OUTPUT:
    
Persistent bibasilar opacities likely due to scarring given persistence over time . There is however new hazy opacity at the right lung base which could represent a superimposed infection .