Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest . Multiple wires external to the patient limits evaluation of the left lung base . Heart size and mediastinal contours are stable . Lung volumes remain very low . Bibasilar opacities have slightly increased since the prior exam and are very symmetric with sharply distinct margins , entirely consistent with atelectasis . No large pleural effusion or pneumothorax .
    OUTPUT:
    
Very low lung volumes with slight interval increase in bibasilar atelectasis .