Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest views were obtained with patient in upright position . Analysis is performed in direct comparison with the next preceding similar study of ___ . The heart size remains normal . No configurational abnormality is identified . Thoracic aorta moderately widened and elongated as before , but no local contour abnormalities are seen . Left - sided hemithorax remains normal . On the right side , the right pleural effusion persists postoperatively and blunts the right - sided lateral sinus and obliterates the diaphragmatic contours . In comparison with the next preceding study , the at that time existing hydropneumothorax has changed as the air component has been absorbed and the present pleural effusion remains and extends into the posterior pleural sinuses as identified on the lateral view . Centrally located surgical clips identify the area of pneumectomy just below the right hilum . There is no evidence of new pulmonary parenchymal abnormalities in the remaining right upper lobe area . Pleural thickening exists , surrounding the apex , but no pneumothorax remains .
    OUTPUT:
    
Pleural effusion or possibly scar formations status post right middle lobe and lower lobectomy . No remaining pneumothorax . Left - sided hemithorax remains normal .