Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As shown on the CT of the abdomen , there is mild bibasilar atelectasis without radiologic evidence of pneumonia . The mediastinal and cardiac contours are unchanged . There is no pleural effusion and no pneumothorax .
    OUTPUT:
    
Mild bibasilar atelectasis . There is no evidence of pneumonia .