Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear without focal consolidation , pleural effusion or pneumothorax . There is no pulmonary edema . Hyperinflation of the lung likely reflects COPD . The heart is normal in size . The patient is status post median sternotomy , and a prosthetic aortic valve is also noted .
    OUTPUT:
    
No acute cardiopulmonary process .