Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since ___ , postoperative changes following thymectomy are noted . Mild pulmonary edema is new . Bilateral chest tubes are noted . Widening of the cardiomediastinal silhouette may be expected postoperatively , however , close attention is recommended on follow up studies to monitor for possible hematoma . There is moderate bibasilar atelectasis and small bilateral pleural effusions . No pneumothorax . Median sternotomy wires are intact and aligned .
    OUTPUT:
    
1 . Mild pulmonary edema , moderate bibasilar atelectasis , and small bilateral pleural effusions since ___ . No pneumothorax . 2 . Widening of the cardiomediastinal silhouette is expected postoperatively , however , close attention is recommended on follow up studies to monitor for possible hematoma .