Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is normal . The aortic knob demonstrates mural calcifications . There is a moderate to large hiatal hernia noted . Mediastinal contours are otherwise unremarkable . Hilar contours are within normal limits , and there is no pulmonary vascular congestion . Lungs are clear . No pleural effusion or pneumothorax is visualized . There are mild degenerative changes in the thoracic spine .
    OUTPUT:
    
Moderate to large hiatal hernia . No acute cardiopulmonary abnormality .