Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral radiographs of the chest demonstrates clear lungs . Top normal to mild enlargement of cardiac silhouette is seen . The hilar and cardiomediastinal contours are otherwise normal . There is no pneumothorax or pleural effusion . Pulmonary vascularity is normal . A large hiatal hernia with an air - fluid level is seen in the retrocardiac region .
    OUTPUT:
    
1 . No acute cardiopulmonary process . 2 . Top normal to mild enlargement of cardiac silhouette . 3 . Hiatal hernia .