Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes , though lungs are clear without effusion or pneumothorax . The heart size is normal , the mediastinal contours are unremarkable . There is no displaced rib fracture .
    OUTPUT:
    
No chest injury . If there is further concern for rib fracture , recommend repeat dedicated views with a BB marker to mark the site of pain .