Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest . Mild bibasilar atelectasis is seen . Query subtle posterior opacity on the lateral view , not well substantiated on the frontal view , may be due to atelectasis , but early infectious process or aspiration can not be excluded in the appropriate clinical setting . There is no pleural effusion or pneumothorax . The cardiomediastinal and hilar contours are normal .
    OUTPUT:
    
Mild bibasilar atelectasis . Query subtle posterior opacity on the lateral view , not well substantiated on the frontal view , may be due to atelectasis , but early infectious process or aspiration can not be excluded in the appropriate clinical setting . .