Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are very low , similar to prior . Linear and patchy opacities in both lung bases are consistent with atelectasis but consolidation can not be excluded . No pleural effusion or pneumothorax . Heart size and mediastinal contours are stable .
    OUTPUT:
    
Very low lung volumes . Bibasilar opacities are consistent with atelectasis but consolidation can not be excluded .