Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Cardiac silhouette size is normal and unchanged . Mediastinal and hilar contours are similar . Pulmonary vasculature is normal . Linear opacities in the lung bases are compatible with areas of subsegmental atelectasis . No focal consolidation , pleural effusion or pneumothorax is detected .
    OUTPUT:
    
Low lung volumes with bibasilar subsegmental atelectasis . No radiographic evidence for pneumonia .