Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged . There is no pleural effusion or pneumothorax . The lungs appear clear . There is perhaps vague callus about the right anterior fifth and sixth ribs , which may relate to the given history of recent subacute injury , but no lucencies or displaced fractures are identified . Small osteophytes are present throughout the thoracic spine .
    OUTPUT:
    
No evidence of acute disease . No evidence of displaced rib fracture ; equivocal callus along the right anterior fifth and sixth ribs .