Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right IJ central line is present , tip overlying distal SVC at the cavoatrial junction . No pneumothorax is detected . The patient is status post sternotomy . There is prominence of the cardiac mediastinal silhouette , which is not significantly changed . Patchy opacity at both lung bases , at least some of which is accounted for by atelectasis . Blunting of the left costophrenic angle is consistent with a small effusion . There is minimal upper zone redistribution , but no overt CHF . Tiny metallic density again noted the left upper lung , question surgical clip . The lateral view shows an oblong opacity in the posterior segment of a lower lobe on one side . This is new compared with a CT dated ___ .
    OUTPUT:
    
1 . Patchy opacity at both bases , similar , though slightly different in configuration , compared with ___ . 2 . Oblong opacity in the lower lobe posteriorly , new compared with ___ CT scan . The differential diagnosis includes a pneumonic infiltrate . Rounded atelectasis and loculated fluid are considered less likely .