Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded and clear . No focal consolidations . No pulmonary edema . Stable enlargement of the cardiomediastinal silhouette . The rounded retrocardiac opacity likely represents a hiatal hernia . No pleural effusion . No pneumothorax .
    OUTPUT:
    
No evidence of pneumonia . Hiatal hernia .