Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The heart size is top normal and accentuated at due to low lung volumes . The aorta is mildly unfolded . The mediastinal and hilar contours are unremarkable . The pulmonary vasculature is normal . There are minimal linear opacities within the lung bases compatible with subsegmental atelectasis . No focal consolidation , pleural effusion or pneumothorax is seen . There are mild degenerative changes in the thoracic spine .
    OUTPUT:
    
Low lung volumes with mild bibasilar atelectasis .