Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear of focal consolidation , pleural effusion or pneumothorax . Bullae may be seen in the right midlung . There is a left cardiac pacemaker with stable position of two leads terminating over the right atrium and right ventricle . The heart size is mildly enlarged . The mediastinal contours are normal . A right ___ anterior fracture is of unknown chronicity .
    OUTPUT:
    
Right 6th rib fracture of unknown chronicity . Correlate with areas of focal tenderness as chest radiographs are not sensitive for detection of trauma .