Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are somewhat hyperexpanded with flattening of the hemidiaphragms , similar to the prior study . There is no focal airspace opacity to suggest pneumonia . The pulmonary vasculature is within normal limits . The aorta is unfolded and tortuous . The cardiomediastinal silhouette is normal . There is no pleural effusion or pneumothorax . There are numerous healed bilateral rib fractures .
    OUTPUT:
    
1 . No evidence of acute cardiopulmonary abnormality .