Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is bilateral lower lobe atelectasis . The lungs are otherwise clear . Note is made of an azygos fissure . The hilar and cardiomediastinal contours are normal . There is no pneumothorax or pleural effusion . Pulmonary vascularity is normal . No displaced rib fracture is seen .
    OUTPUT:
    
No evidence of pneumothorax or displaced rib fracture .