Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Focal opacity projecting over the left lung apex is compatible with changes seen on prior exam , and ___ demonstrating a cavitary opacity . Overall , the appearance has improved since prior chest x-ray from ___ . This could be due to scarring from prior infection . Elsewhere , the lungs are clear . The cardiomediastinal silhouette is within normal limits . Esophageal stents are seen with interval telescoping of one stent into the other since prior .
    OUTPUT:
    
Esophageal stents are seen with interval telescoping of one stent into the other since prior exam .