Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Probable background hyperinflation / COPD . The cardiomediastinal silhouette is probably unchanged , allowing for positioning and technical differences . No CHF or appreciable effusion . There are extensive changes in the left upper zone that are in keeping with findings on the ___ CT scan , with focal left upper zone opacity , some retraction superiorly , and slight tenting of the left hemidiaphragm . This apparently corresponds to a previous radiofrequency ablation site , with chronic fibrotic changes . A single clip is noted nearby . On the right , there is focal opacity at the right lung apex , extending medially to the right paratracheal soft tissue . This is similar to the scout film from the ___ CT scan and likely corresponds to the right upper posterior mediastinal mass identified on that CT scan . There may be minimal atelectasis at both bases . However , otherwise , no focal opacity to suggest acute pneumonic infiltrate or site of aspiration is identified . No pneumothorax is detected . Small pulmonary nodules identified on CT scan are not apparent radiographically . The possibility of a small pericardial effusion would be difficult to exclude . There multifocal degenerative changes in the spine and about the shoulders . No obvious lytic or sclerotic lesion is detected . No compression fracture is detected .
    OUTPUT:
    
1 . Right paratracheal / right apical opacity likely corresponds to a mediastinal mass seen on the ___ chest CT . This extended posteriorly on the previous CT scan . If the patient 's symptoms are in the upper right paramedian back , then this might account for the symptoms . 2 . Opacities at the left lung apex are stable and likely correspond to a site of prior radiofrequency ablation . 3 . No CHF , new infiltrate , effusion , or pneumothorax is detected . Minimal bibasilar atelectasis noted .