Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs were obtained . There is interval improvement in bilateral pleural effusions and associated bibasilar atelectasis . There is an apparently new retrosternal lucency , which is difficult to assess due to suboptimal positioning on the lateral view . No focal consolidation , pneumothorax , or pulmonary edema is seen . Postoperative cardiomediastinal silhouette and hilar contours are stable .
    OUTPUT:
    
1 . Interval improvement in bilateral pleural effusions and adjacent atelectasis . 2 . Retrosternal lucency , possibly related to postoperative gas collection versus pre-existing bullae . Repeat lateral CXR with improved positioning may be helpful for initial further evaluation .