Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs were obtained . Compared to the prior study in ___ , the present study is mildly under penetrated . Despite this limitation , there is no definite evidence of new consolidation effusion or pneumothorax . There is mild bibasilar atelectasis . Mild cardiomegaly is unchanged . There are multilevel degenerative changes of the thoracic spine . A safety pin projecting over the lower thoracic spine is likely outside the patient .
    OUTPUT:
    
Low lung volumes and mild bibasilar atelectasis .