Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . This accentuates the size of the cardiac silhouette which is top normal . Mediastinal and hilar contours are unremarkable . There is no pulmonary edema . Patchy opacities in the lung bases are slightly progressed and likely reflect atelectasis . No pleural effusion or pneumothorax is identified . No acute osseous abnormalities seen .
    OUTPUT:
    
Bibasilar atelectasis in the setting of low lung volumes .