Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours are stable . Blunting of the left costophrenic sulcus and pleural thickening appear unchanged and probably chronic . In the right lower hemithorax , there is a patchy geographic opacification that may be associated with pleural but perhaps parenchymal scarring . However , the appearance is unchanged without evidence for superimposed acute disease . There is no pneumothorax . Bony structures are unremarkable .
    OUTPUT:
    
No significant change . Areas of scarring and pleural thickening at the level of the base of each hemithorax , but without evidence for superimposed acute disease .