Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bilateral small pleural effusions and extensive mediastinal adenopathy are stable . Improved bibasilar atelectasis , without consolidation , pulmonary edema , or pneumothorax . Known tracheal stent is not well visualized in the current study . Three rounded dense objects in the left paratracheal region , likely represent retained pills in the upper esophagus due to partial obstruction at this level by the mediastinal mass .
    OUTPUT:
    
Improved bibasilar atelectasis . Retained pills in the upper thoracic esophagus .