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 the next preceding similar study obtained nine hours earlier during the same day . There is less amount of pleural effusion on the left side indicating successful performance of thoracocentesis . Still some blunting of the lowermost lateral pleural sinus remains . Right - sided pleural effusion appears unchanged .
    OUTPUT:
    
No evidence of pneumothorax on either left or right - sided in the apical region .