Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post aortic valve replacement . Heart appears borderline in size . The mediastinal and hilar contours appear within normal limits . The chest appears mildly hyperinflated . There is no pleural effusion or pneumothorax . The lungs appear clear . Mild degenerative changes affect the mid thoracic spine .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease .