Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The aorta is mildly unfolded . Mediastinal and hilar contours are otherwise within normal limits . Pulmonary vasculature is normal . Subsegmental atelectasis is noted in the left lower lobe . The lungs are otherwise clear without focal consolidation . No pleural effusion or pneumothorax is present . No acute osseous abnormalities seen .
    OUTPUT:
    
No acute cardiopulmonary abnormality .