Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal and unchanged . The mediastinal and hilar contours are unchanged , allowing for differences in patient positioning . The pulmonary vasculature is normal . Bandlike lower lung opacities most compatible with atelectasis . The upper lungs are clear . No pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
No significant interval change . Persistent lower lung atelectasis .