Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral views of the chest provided . Lung volumes somewhat low . No free air below the right hemidiaphragm . Mild basilar atelectasis noted bilaterally . There is no focal consolidation , effusion , or pneumothorax . The cardiomediastinal silhouette is normal . Imaged osseous structures are intact .
    OUTPUT:
    
Med bibasilar atelectasis . No signs of pneumoperitoneum .