Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate well expanded clear lungs . There is no pleural effusion or pneumothorax . The cardiomediastinal and hilar contours are unremarkable . There is a healed left posterior 8th rib fracture , unchanged from prior study .
    OUTPUT:
    
No evidence of pneumonia .