Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal , and hilar contours appear unchanged . Multifocal opacities which persist in the upper lungs with volume loss suggest chronic scarring without definite superimposed disease . Blunting of the left posterior costophrenic sulcus is unchanged , suggesting either trace pleural effusion or pleural thickening . Bony structures are unremarkable .
    OUTPUT:
    
Stable appearance of the chest .