Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs were obtained . Lung volumes are low . There is no consolidation , effusion , or pneumothorax . Mild bibasilar atelectasis is present . Cardiac and mediastinal contours are normal . There is no effusion or pneumothorax . No displaced rib fracture .
    OUTPUT:
    
No acute cardiopulmonary process . A rib series with a marker placed at site of pain is more sensitive for subtle rib injury .