Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest are compared to previous exam from ___ . Low lung volumes again seen . The lungs , however , remain clear and there is no effusion or pneumothorax . Cardiomediastinal silhouette is within normal limits . Osseous and soft tissue structures are unremarkable , specifically there is no visualized displaced rib fracture .
    OUTPUT:
    
No acute cardiopulmonary process .