Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs were obtained . The lungs are well expanded and clear . The previously seen irregular focal opacity in the left base and adjacent lucency is no longer apparent . No consolidation , effusion , or pneumothorax is present . The cardiac and mediastinal contours are normal .
    OUTPUT:
    
Normal chest radiograph . Resolution of previously seen opacity in the left base which may have been focal atelectasis .