Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral radiographs of the chest demonstrate bilateral lower lobe atelectasis . The lungs are otherwise clear . The aorta is unfolded and the hilar and cardiomediastinal contours are otherwise normal . There is no pneumothorax or pleural effusion . Pulmonary vascularity is normal .
    OUTPUT:
    
No acute cardiopulmonary process .