Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a large hiatal hernia . Associated atelectasis is present at the lung bases , but probably unchanged . Otherwise , the lungs appear clear . There is no definite pleural effusion . There is no pneumothorax . The cardiac , mediastinal and hilar contours appear unchanged .
    OUTPUT:
    
Large hiatal hernia . No evidence of acute disease .