Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were provided . There is minimal atelectasis in the left lung base , likely in the region of the inferior lingula as seen on prior study . There is no new consolidation , effusion , or pneumothorax . No signs of CHF . Cardiomediastinal silhouette appears normal . Bony structures appear intact . Mild degenerative changes of the shoulders are noted . No free air below the right hemidiaphragm .
    OUTPUT:
    
Mild left lung base atelectasis . Otherwise unremarkable study .