Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Linear atelectasis or scarring at the left lung base . Otherwise , the lungs are clear without consolidation . No pneumothorax seen . No pleural effusion seen . The cardiomediastinal contour is within normal limits , the heart is not enlarged . No free air seen under the diaphragm . The visualized bony structures are unremarkable in appearance .
    OUTPUT:
    
No acute cardiopulmonary process seen . Linear atelectasis or scarring at the left lung base .