Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable view of the chest is compared to previous exam from ___ . Right chest wall dual - lead pacing device is again seen . There is retrocardiac opacity silhouetting the descending thoracic aorta . This could potentially be due to atelectasis given lower lung volumes ; however , consolidation is not excluded . Elsewhere , lungs are grossly clear noting lower lung volumes . Cardiomediastinal silhouette is stable as are the osseous structures .
    OUTPUT:
    
Lower lung volumes on the current exam . Left lower lobe opacity seen medially , potentially due to atelectasis ; however , infiltrate is not completely excluded . Clinical correlation is suggested .