Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal silhouette and pulmonary vasculature are unremarkable . The lungs are clear . There is no pleural effusion or pneumothorax . There is cortical regularity compatible with fracture of the right posterior sixth rib which is likely chronic . No displaced left - sided rib fractures identified . Surgical clips are seen in the left upper abdomen .
    OUTPUT:
    
No acute intrathoracic abnormality . No definite acute displaced rib fracture is identified .