Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Given low lung volumes , there is not appear free is substantial change from the prior radiograph . The right hemidiaphragm remains elevated . Bibasilar opacities are likely related to atelectasis . Cardiac size is within normal limits . There is no large pleural effusion or pneumothorax . Chronic likely post traumatic changes seen at the right shoulder .
    OUTPUT:
    
Unchanged radiograph . Patchy bibasilar opacities likely related to atelectasis .