Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The study is somewhat underpenetrated . Lung volumes are slightly low , but grossly clear . The heart is not enlarged . The mediastinal and hilar contours are normal . There is no large pleural effusion or pneumothorax . There is no pulmonary edema .
    OUTPUT:
    
No evidence of acute cardiopulmonary abnormality .