Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the prior exam , there is increasing opacification of the bilateral bases which is likely atelectasis . There is no pulmonary edema , pleural effusion , or pneumothorax . The cardiomediastinal silhouette is normal .
    OUTPUT:
    
No definite evidence of pneumonia . New bibasilar opacities are likely atelectasis . Recommend a repeat chest radiograph later today or tomorrow to ensure the opacities are not increasing .