Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Evaluation is somewhat limited by underpenetration . Lung volumes are slightly low . There is no focal airspace opacity to suggest pneumonia . The heart is not enlarged . The mediastinal and hilar contours are normal . There is no pleural effusion or pneumothorax . No subdiaphragmatic free air is detected .
    OUTPUT:
    
No evidence of acute cardiopulmonary abnormality and no evidence of subdiaphragmatic free air .