Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The left chest tube has been removed . There is no evidence of pneumothorax . There is unchanged subcutaneous gas overlying the left hemithorax . The cardiomediastinal silhouette , pulmonary vasculature , and aorta are within normal limits . The lungs are clear . There is no evidence of pleural effusion . Left posterior ___ rib fractures are again visualized .
    OUTPUT:
    
1 . Removal of left chest tube . No evidence of pneumothorax . 2 . Left fourth - ninth rib fractures .