Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest views were obtained with patient in upright position . Comparison is made with the next preceding similar study of ___ . Cardiovascular , mediastinal structures are unchanged . No pulmonary vascular congestion is present . The previously identified small amount of pleural densities on the right lower base persists . In comparison with the next preceding study suggests that the amount of fluid has increased mildly . No other new pulmonary abnormalities are seen , and no new parenchymal lesions are identified . The left hemithorax remains unchanged . No pneumothorax has developed in the apical area .
    OUTPUT:
    
Mild increase of postoperative right - sided pleural effusion in this patient status post VATS procedure .