Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral chest radiograph demonstrates low lung volumes . A left chest pacemaker is identified , it s leads which appear intact and in stable position . The heart is enlarged , not significantly changed . There is no overt pulmonary edema . There is no large pleural effusion though obscuration of the left costophrenic angle may reflect trace pleural fluid or alternatively atelectasis . Relative to prior examination , retrocardiac opacification with obscuration of the left hemidiaphragm is new for which infectious process can not be excluded . Findings can be additionally secondary to atelectasis . Opacification involving the right mid and upper lung zone appears somewhat more conspicuous relative to prior study . There is no pneumothorax . Imaged osseous structures and upper abdomen are without an acute abnormality .
    OUTPUT:
    
Low lung volumes . Stable cardiomegaly . Right mid and upper lung zone consolidation as well as retrocardiac opacification are more conspicuous or new relative to prior study for which an infectious process is difficult to exclude .