Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are unchanged compared to ___ . The mediastinal contour is not widened . No pleural effusion or pneumothorax is identified . Minimal opacification of the left lung base likely represents overlying soft tissues ; however , atelectasis may be possible .
    OUTPUT:
    
No acute cardiopulmonary process .