Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The previously seen left apical pneumothorax is no longer visualized . Again seen is a right IJ central line - on the current study , the tip lies near the cavoatrial junction . Inspiratory volumes are improved . Prominent cardiomediastinal silhouette is similar to the prior film , with sternotomy wires again noted . There is upper zone zone redistribution , without other evidence of CHF . Retrocardiac opacity is again seen . Additional atelectasis at the left base laterally is improved . Minimal subsegmental atelectasis is present at the right lung base . Equivocal minimal blunting of the right costophrenic angle could be new .
    OUTPUT:
    
1 . Previous left apical pneumothorax no longer visualized . 2 . Improved inspiratory volumes , with some improvement of atelectasis at left lung base . Persistent retrocardiac opacity .