Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart and mediastinal contours are within normal limits . The lungs are clear . There is no pleural effusion or pneumothorax . The posterolateral aspect of the left seventh rib shows a subtle defect concerning for a nondisplaced fracture .
    OUTPUT:
    
Possible nondisplaced fracture of the posterolateral left seventh rib ; if clinical concern for additional rib fracture , a dedicated rib series may be considered . Findings were discussed by Dr . ___ with ___ at 20 :00 on ___ by phone .