Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is mildly enlarged . The aortic arch is calcified . The lungs are hyperinflated . A rounded contour projecting along the lower central mediastinum suggests a substantial hiatal hernia , although not fully characterized . The lungs appear clear . There are no pleural effusions or pneumothorax . The bones appear demineralized . Moderate - to - severe rightward convex curvature is centered along the upper lumbar spine .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease . Rounded contour in the lower mediastinum , probably a substantial hiatal hernia .