Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Residual right - sided pneumothorax is minimal , measuring 1 mm and is unchanged . Right moderate pleural effusion with atelectasis is unchanged . Left basilar atelectasis is improved . Mediastinal and cardiac contour is normal in this patient with prior sternotomy for thymectomy . Right - sided Port - A - Cath ends in mid-to - lower SVC .
    OUTPUT:
    
The patient had surgery for removal of a pleural - based mass . Residual right - sided apical pneumothorax is minimal and unchanged .