Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are unremarkable . Pulmonary vasculature is normal . Lungs are clear . No pleural effusion or pneumothorax is identified on this supine exam although the left costophrenic sulcus is not included in the field of view . No acute osseous abnormality is identified . Old left - sided rib fractures are noted .
    OUTPUT:
    
No acute cardiopulmonary abnormality .