Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were obtained demonstrating mild left basilar atelectasis . Otherwise , lungs are clear . No large effusion or pneumothorax . Cardiomediastinal silhouette is normal . No definite rib fractures are seen .
    OUTPUT:
    
Mild left basilar atelectasis . No definite rib fractures . If there is strong clinical concern for rib fracture , dedicated rib series is advised with a skin BB marking the site of maximal pain .