Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are within normal limits . The lung fields are clear . There is no pneumothorax , fracture or dislocation . Questioned free air below the diaphragm could represent massively dilated colon .
    OUTPUT:
    
1 . Question of free air below the diaphragm that also could represent massively dilated colon . 2 . No acute cardiopulmonary abnormality .