Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low , and this accentuates the size of the cardiac silhouette which is likely top normal . Apparent mediastinal widening is also likely due to low lung volumes . The aortic knob is calcified . There is crowding of the bronchovascular structures but no overt pulmonary edema is present . No focal consolidation , pleural effusion or pneumothorax is present . There are multilevel degenerative changes in the thoracic spine . Diffuse demineralization of the osseous structures is noted .
    OUTPUT:
    
Low lung volumes . No acute cardiopulmonary abnormality .