Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes with bibasilar atelectasis , which is unchanged in comparison to the prior chest radiograph . The lungs are otherwise clear . Heart size is stable . The mediastinal and hilar contours are stable . The pulmonary vasculature is normal . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Low lung volumes with bibasilar atelectasis , but no evidence of focal consolidation to suggest pneumonia .