Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are normally expanded and clear . The heart is top normal but not enlarged . The mediastinal and hilar contours are normal . There is no pleural effusion or pneumothorax . There are gas - filled loops of large bowel in the left upper quadrant .
    OUTPUT:
    
No evidence of acute cardiopulmonary abnormality . No cardiomegaly .