Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is status post left upper lobectomy . Opacity in the left apex is of unclear etiology . There is no basal effusion or pneumothorax . There is no consolidation in the right lung . The cardiomediastinum is shifted to the left due to lobectomy . The left hemidiaphragm is not seen . Retrocardiac opacities are likely due to atelectasis . Imaged osseous structures are intact . No free air below the right hemidiaphragm is seen .
    OUTPUT:
    
1 . Opacity in the left apex is of unclear etiology . It could represent postoperative change , but correlation with prior cross - sectional imaging is recommended . 2 . No consolidation in the right lung .