Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left basilar linear atelectasis is unchanged . The lungs are otherwise clear . There is no pneumothorax . The heart and mediastinum are within normal limits . An old healed left rib fracture is again noted . No acute rib fractures are identified . Multilevel spinal degenerative changes are stable .
    OUTPUT:
    
No acute rib fracture identified . Old healed left rib fracture . No pneumothorax . Stable left basilar linear atelectasis with otherwise clear lungs .