Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiograph demonstrates no focal opacity concerning for pneumonia . When compared to prior study dated ___ , there is an essentially no change . Cardiac and hilar contours are within normal limits . Mild mediastinal fullness , stable in appearance over several years , possibly reflective of an enlarged thyroid . There is no pleural effusion .
    OUTPUT:
    
No focal opacity concerning for pneumonia .