Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Increased opacity seen in the right mid lung and there are changes suggesting of underlying fibrotic changes in the perihilar regions bilaterally , right greater than left . There is also increased density in the retrosternal clear space on lateral view with associated linear , spiculated opacities . The lungs are otherwise clear . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities identified .
    OUTPUT:
    
Changes in the perihilar regions of the lungs bilaterally suggesting underlying scarring . Given regions of opacity particularly in the right lower lung , superimposed infection or other acute process can not be excluded without prior imaging to evaluate for stability . Followup will be necessary unless prior becomes available to document stability particularly for evaluation of the increased opacity in the retrosternal clear space .