Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post mitral valve replacement surgery . The heart is again mild to moderately enlarged . Unfolding appears similar along the thoracic aorta . The cardiac , mediastinal and hilar contours are more generally stable . There is no pleural effusion or pneumothorax . The lungs appear clear .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease .