Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . No confluent opacity is identified . A linear density overlying the spine on lateral view may reflect subsegmental atelectasis . There is no pulmonary edema or pleural effusions . No pneumothorax is identified . Cardiomediastinal and hilar contours are within normal limits . There is mild elevation of the left hemidiaphragm , unchanged from prior .
    OUTPUT:
    
No acute cardiopulmonary process