Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest demonstrate low lung volumes , accounting for apparent atelectasis at the lung bases . There is no focal pneumonia , pleural effusion , or evidence of pneumothorax . Remote right rib fractures are again seen . The cardiomediastinal silhouette is unremarkable .
    OUTPUT:
    
No acute cardiopulmonary disease .