Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . Streaky opacities identified at the left lung base laterally , potentially due to atelectasis or scarring . Elsewhere , the lungs are clear . There is no effusion . The cardiomediastinal silhouette is within normal limits . Slightly tortuous thoracic aorta is identified . Hypertrophic changes are noted in the spine . No free intraperitoneal air seen below the diaphragm .
    OUTPUT:
    
No acute cardiopulmonary process .