Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest was obtained . The heart size is mildly enlarged . Lungs appear clear without focal consolidation , pleural effusion , or pneumothorax . A large skin fold overlies the right lateral chest wall . The right posterior 9th rib is fractured and mildly displaced .
    OUTPUT:
    
Mildly displaced right posterior 9th rib fracture . No pneumothorax .