Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The cardiac , mediastinal and hilar contours are normal . Pulmonary vasculature is normal . Streaky opacities in the lung bases most likely reflect atelectasis . These findings appear relatively unchanged compared to the previous radiograph . No pleural effusion or pneumothorax is seen . There is no acute osseous abnormality .
    OUTPUT:
    
Low lung volumes with probable bibasilar atelectasis .