Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The heart size is mildly enlarged , but similar compared to the previous exam . The aorta remains tortuous . Pulmonary vasculature is normal . Streaky bibasilar airspace opacities most likely reflect atelectasis in the setting of low lung volumes . No focal consolidation , pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Low lung volumes with probable mild bibasilar atelectasis .