Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate low lung volumes , though clear lungs without focal consolidation , effusion , or pneumothorax . The heart size is normal , the mediastinal contours are normal . Note is made of mild degenerative change of the visualized thoracic spine . There is an azygous fissure .
    OUTPUT:
    
Low lung volumes , in an otherwise normal chest radiograph .