Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The ETT tip ends approximately 4 cm from the carina . The right IJ tip ends in the mid SVC . Median sternotomy wires appear intact and unchanged in position . Pleural drains are unchanged in position . The stomach remains distended and filled with air , perhaps more so compared to the prior exam . Stable postoperative appearance of the cardiomediastinal silhouette . There is moderate pulmonary edema that appears slightly improved with improved aeration , although lung volumes remain low . Probable layering small right pleural effusion is overall unchanged . No pneumothorax .
    OUTPUT:
    
1 . Persistent lower lung volumes and mild - to - moderate pulmonary edema , slightly improved from the prior exam . 2 . ETT tip approximately 4 - cm from the carina . 3 . Interval increase in stomach distension .