Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is at the upper limits of normal size . The aortic arch is partly calcified . The mediastinal and hilar contours appear within normal limits . There is no pleural effusion or pneumothorax . The lungs appear clear . Small anterior osteophytes are present throughout the mid - to - lower thoracic spine . There is an anomalous right eighth rib that appears to bifurcate into two ribs anteriorly .
    OUTPUT:
    
No evidence of acute disease .