Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Fiducial seeds in the left mid chest are unchanged . A linear opacity in this region either represents atelectasis or tumor recurrence , and is better characterized on the recent chest CT . No new opacity or nodule is identified . There is no pulmonary edema . Since the prior CT , a left - sided pleural effusion has decreased in size . A small pleural effusion persists . There is no right pleural effusion . There is no pneumothorax . There is stable volume loss in the right hemithorax with shift of the cardiomediastinal silhouette . The cardiomediastinal silhouette is otherwise normal .
    OUTPUT:
    
1 . Interval decrease in size of the left pleural effusion . A small pleural effusion persists . No pneumothorax . 2 . Opacity in the left mid lung zone in the area of the fiducial seeds is better characterized on the recent CT and likely represents a combination of tumor and / or atelectasis .