Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded . Minimal engorgement of the right hilum is not significantly changed from prior . Otherwise , there are no focal opacities . Cardiomediastinal and hilar contours are unremarkable . There is no pleural effusion or pneumothorax . Sternotomy wires and surgical clips in the mediastinum from prior surgery are unchanged in appearance .
    OUTPUT:
    
No evidence of pneumonia .