Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low , accounting for bronchovascular crowding . No focal parenchymal opacities are identified . The cardiomediastinal and hilar contours are unremarkable . There is no pleural effusion or pneumothorax . Bony structures are intact . There is no evidence of subdiaphragmatic free air .
    OUTPUT:
    
Unremarkable chest radiographic examination . No fractures identified . However , as this examination has limited sensitivity for detection of rib fractures , dedicated rib views should be obtained if there is further concern .