Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded and clear . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is unremarkable . There is a small hiatal hernia . The small rounded indentation is seen on the gastric bubble , which could possibly represent a mass in the hernia .
    OUTPUT:
    
1 . No acute cardiopulmonary process . 2 . Small rounded indentation on the gastric bubble , possibly representing a mass in the hiatal hernia . Recommend barium swallow study or CT exam to evaluate for mass .