Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Small right pleural effusion is smaller compared to ___ . There is no consolidation or pneumothorax . Hyperlucent lines paralleling the lower chest wall are symmetrical and likely reflect exterior soft tissue structures . Mild opacity at the right lung base is likely atelectasis . Cardiomediastinal silhouette is normal size . Levoscoliosis of the thoracic spine is again noted . Old fracture at the right mid clavicle is unchanged .
    OUTPUT:
    
Small right pleural effusion is smaller compared to ___ . Mild opacity at the right lung base is likely atelectasis .