Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . There is no focal consolidation , pleural effusion or pneumothorax . Heart size is normal . The mediastinal silhouette and hilar contours are unchanged . The patient is status post left thoracotomy . Median sternotomy wires are intact with a prosthetic aortic valve . Elevation of the left hemidiaphragm is unchanged since at least ___ .
    OUTPUT:
    
No pneumonia , effusion , or edema .