Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Left basal opacity is most suggestive of atelectasis . Otherwise the lungs are clear . No signs of pneumonia or edema . No large effusion or pneumothorax . Cardiomediastinal silhouette appears normal . Bony structures are intact .
    OUTPUT:
    
Mild left basal atelectasis .