Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Upright PA and lateral radiographs of the chest . The lungs are slightly underinflated , but there is no focal airspace consolidation . There are bibasilar opacities which likely reflect atalectasis . The aorta is calcified and slightly unfolded , similar to prior . There is no cardiomegaly . The mediastinal and hilar contours are normal . There is no pleural effusion or pneumothorax . Degenerative changes throughout the thoracic spine are similar to prior .
    OUTPUT:
    
Low lung volumes with opacities at the lung bases which may reflect atalectasis but infection can not be excluded . If indicated , a repeat radiograph with better inspiration may be obtained for improved assessment of the lung bases .