Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view of the chest has been obtained with patient in semi-upright position . Comparison is made with a similar preceding study obtained three hours earlier during the same day . During the latest interval , a right - sided pigtail - end drainage catheter has been introduced through the lower lateral chest wall remaining with its pigtail tip end in the lateral lower portion of the right pleural sinus . The drainage was very effective as the pleural effusion on the right base has been practically eliminated totally making the contour of the right diaphragm well visible . There is no evidence of pneumothorax in the apical area of the right hemithorax . Previously described tracheal cannula remains in unchanged appropriate position . The pulmonary vascular pattern has not been altered . The left - sided basal pleural density which appeared similar with the previous appearance of the right side remains unchanged .
    OUTPUT:
    
Successful drainage of right - sided pleural effusion .