Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The atient is status post coronary artery bypass graft surgery . The heart is mildly enlarged . There is a large hiatal hernia with an air - fluid level . Otherwise , the mediastinal and hilar contours are unremarkable . The lungs appear clear . The chest is hyperinflated . There is no pleural effusion or pneumothorax . Bony structures are unremarkable .
    OUTPUT:
    
No evidence of acute disease . Hyperinflation . Large hiatal hernia . Status post coronary artery bypass graft surgery .