Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . A linear opacity in the left lung base may be an area of subsegmental atelectasis or scarring and is slightly more pronounced than on ___ . No confluent opacities identified . There is no pulmonary edema or pleural effusions . Cardiomediastinal and hilar contours are within normal limits .
    OUTPUT:
    
No acute cardiopulmonary process .