Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Allowing for supine AP portable technique and low lung volumes , the cardiac , mediastinal and hilar contours are probably within normal limits . The lungs appear clear . There are no pleural effusions or pneumothorax . Irregular contours along the left posterior lateral fifth and sixth ribs suggest prior fractures , but probably not recent .
    OUTPUT:
    
No definite evidence of recent injury . Old left - sided rib fractures .