Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post median sternotomy and cardiac valve replacement . Lungs remain hyperinflated suggesting chronic obstructive pulmonary disease . No focal consolidation is seen . There is no pleural effusion or pneumothorax . The cardiac and mediastinal silhouettes are stable . No displaced fracture is identified .
    OUTPUT:
    
No acute cardiopulmonary process .