Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a small residual focus of right middle lobe opacity . Hazy lingular atelectasis is similar to prior . There is no effusion or pneumothorax . The cardiomediastinal silhouette is normal . Imaged osseous structures are intact . No free air below the right hemidiaphragm is seen .
    OUTPUT:
    
Mild bilateral residual atelectasis . Right chest wall subcutaneous air has resolved .