Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest demonstrate persistent elevation of the right hemidiaphragm , unchanged since the prior study . Cardiomediastinal sillouette is unchanged and appears enlarged due to prominent mediastinal fat seen on prior CT . Median sternotomy wires are again noted , along with prosthetic aortic valve . The lungs are clear , with no evidence of pleural effusion , pulmonary edema , pneumothorax or focal consolidation concerning for pneumonia . The mediastinal contours are unchanged .
    OUTPUT:
    
No acute cardiopulmonary process . Persistent elevation of the right hemidiaphragm .