Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable AP radiograph is compared to multiple prior studies . Patient is status post median sternotomy with wires which appear intact . Clips are noted along the left mediastinal and cardiac border . Cardiomediastinal and hilar contours are stable . Linear opacity projecting over the left upper lung zone corresponds to a focal area of scarring and fibrosis with traction bronchiectasis as shown on CT dated ___ . Relative to prior chest radiograph dated ___ , lungs are similar in appearance . Interstitial and airspace opacities may reflect substantial vascular congestion . There is no large pleural effusion or pneumothorax . No acute osseous abnormality is detected .
    OUTPUT:
    
Stable cardiomediastinal silhouette . Interstitial and airspace opacities may reflect substantial vascular congestion though superimposed pneumonia can not be excluded in the appropriate clinical setting . Left upper lobe linear opacity corresponds to scarring and fibrosis is identified on CT dated ___ .