Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Surgical clips in the mediastinum are stable . Since ___ , atelectasis at the right midlung and right lung base are substantially improved . Bilateral , small pleural effusions are also significantly improved . No pneumothorax . Hilar contours are normal . Focal widening of the mediastinum at the right paratracheal station is unchanged .
    OUTPUT:
    
1 . Since ___ , atelectasis at the right lung base and bilateral , small pleural effusions are significantly improved . 2 . Persistent area of mediastinal widening at the right lower paratracheal stripe is of uncertain significance and could be a normal postoperative appearance .