Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Linear opacities in the bilateral lung bases likely represent subsegmental atelectasis . The mediastinal contour , hila , and cardiac silhouette are normal . No pleural effusion or pneumothorax . A BB is noted over the right lateral ninth rib without underlying fracture . No osseous abnormality within the limits of plain radiography .
    OUTPUT:
    
Low lung volumes . No osseous abnormality within the limits plain radiography .