Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is no focal consolidation , pleural effusion or pneumothorax . Opacities at the left base likely represent scarring from prior surgery or atelectasis . Cardiomediastinal silhouette is normal . The bones are intact .
    OUTPUT:
    
Left lower lobe scarring or atelectasis . Otherwise , no acute process .