Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . Mild basal atelectasis without convincing evidence for pneumonia or edema . No large effusion or pneumothorax . The cardiomediastinal silhouette is normal . Imaged osseous structures are intact .
    OUTPUT:
    
Mild basal atelectasis . No definite fracture . If there is further concern for rib fracture dedicated rib series advised .