Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Linear opacities in the right lung base along with new elevation of the right hemidiaphragm , suggest extensive areas of subsegmental atelectasis in the right middle and lower lobes . The right upper lobe and left lung appear clear . There is no confluent consolidation . No pneumothorax is evident . Mediastinal and hilar contours are within normal limits . The left heart border appears normal . The right heart border is difficult to assess secondary to atelectasis . No definite rib fracture is identified on this chest radiograph .
    OUTPUT:
    
1 . Atelectasis in the right middle and lower lobes . 2 . No definite rib fracture .