Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Linear scarring in the left lung base is unchanged from prior examination and is confirmed on concurrent CT abdomen and pelvis . No confluent opacity is identified . There is no pulmonary edema or pleural effusions . No pneumothorax is evident . Cardiomediastinal and hilar contours are within normal limits .
    OUTPUT:
    
No acute cardiopulmonary process