Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiomediastinal silhouette and hilar contours are unremarkable . Lungs are clear . Pleural surfaces are clear without effusion or pneumothorax . There is mild elevation of the left hemidiaphragm with visualization of gas filled top normal caliber large bowel under the diaphragm .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Mild elevation of the left hemidiaphragm , cause unclear .