Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours are normal . Pulmonary vasculature is normal . Lung volumes are low with linear opacities at the lung bases most likely reflective of subsegmental atelectasis . No focal consolidation , pleural effusion or pneumothorax is identified . There are mild multilevel moderate degenerative changes in the thoracic spine .
    OUTPUT:
    
Low lung volumes with mild bibasilar subsegmental atelectasis .