Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . The heart size is top normal , exaggerated by low lung volumes . Cardiomediastinal contours are unremarkable . The lungs are clear without focal or diffuse abnormality . Pulmonary vasculature is unremarkable . No pleural effusion or pneumothorax . Osseous structures are unremarkable . No radiopaque foreign bodies .
    OUTPUT:
    
Top normal heart size , exaggerated by low lung volumes .