Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is bilateral lower lobe atelectasis and the lungs are otherwise clear . The hilar and cardiomediastinal contours are normal . There is no pneumothorax or pleural effusion . Pulmonary vascularity is normal .
    OUTPUT:
    
1 . No evidence of pneumonia . 2 . Bilateral lower lobe atelectasis .