Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral radiographs of the chest demonstrate normal heart size . There are low lung volumes . The cardiomediastinal silhouette and hilar contours are normal . The lungs are clear . No pleural effusion or pneumothorax . No displaced rib fracture identified .
    OUTPUT:
    
No acute cardiopulmonary process .