Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs well expanded . Mild bibasilar atelectasis is again noted , similar to prior exam . The lungs are otherwise clear . There is no pleural effusion or pneumothorax . Cardiomediastinal silhouette is unremarkable . A pacemaker is seen overlying left chest with leads in expected location . No evidence of acute traumatic chest injury .
    OUTPUT:
    
No acute cardiopulmonary process . No evidence of acute traumatic chest injury . If concern for rib fracture persists , dedicated rib radiographs can be obtained .