Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is exaggerated as a result of low lung volumes and appears mildly enlarged . Mediastinal and hilar contours are unremarkable . There is mild crowding of the bronchovascular structures without pulmonary edema . Linear opacities in the lung bases are compatible with areas of atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . Mild degenerative changes are detected in the imaged thoracolumbar spine .
    OUTPUT:
    
Low lung volumes with bibasilar atelectasis .