Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are well expanded . A vague opacity is again seen in the left lateral lung base , similar to multiple priors back to ___ and likely representing an area of possible scarring or atelectasis . There is no pleural effusion or pneumothorax . The cardiomediastinal silhouette is unremarkable .
    OUTPUT:
    
No acute cardiopulmonary process .