Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are within normal limits . The pulmonary vasculature is normal . Atelectasis is seen in both lung bases without focal consolidation . No pleural effusion or pneumothorax is seen . Clips from prior cholecystectomy are noted in the right upper quadrant of the abdomen . There is no subdiaphragmatic free air . No acute osseous abnormality is detected .
    OUTPUT:
    
Minimal bibasilar atelectasis . No subdiaphragmatic free air .