Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . Lung volumes are low . Bibasilar and retrocardiac opacities are consistent with atelectasis . The heart size and cardiomediastinal contours are stable . No pleural effusion or pneumothorax .
    OUTPUT:
    
Low lung volumes with bibasilar and retrocardiac opacities most consistent with atelectasis .