Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well inflated , without focal opacities . The cardiomediastinal and hilar contours are unremarkable . There is no pleural effusion or pneumothorax . Assessment of heart size can not be accurately made in an AP projection although appears unchanged compared with prior study from ___ .
    OUTPUT:
    
Unremarkable chest radiograph .