Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are slightly low , similar compared to the prior study . There is no pleural effusion , pulmonary edema , pneumothorax , or focal opacification . Multiple healed left - sided rib fractures are again seen . No acute osseous abnormality is detected .
    OUTPUT:
    
No acute cardiopulmonary process . Posterior left rib fractures are well - healed , seen previously .