Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiograph demonstrates no focal opacity convincing for pneumonia . Patient is status post median sternotomy and mitral valve repair . Sternotomy wires appear intact . Cardiomediastinal and hilar contours are stable in appearance . Blunting of the left costophrenic angle is likely scarring . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
No focal opacity convincing for pneumonia .