Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . Linear left basilar opacities that is unchanged from prior and may represent atelectasis or scarring . The lungs are otherwise clear . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities detected . Surgical clips seen in the upper abdomen .
    OUTPUT:
    
No acute cardiopulmonary process , no evidence of pneumonia .