Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view of the chest has been obtained with patient in sitting semi-upright position . Comparison is made with the next preceding similar portable examination of ___ . The previously existing small caliber pigtail catheter draining the left pleural base has been exchanged with a large caliber chest tube now seen to terminate in the left apical area . The amount of pleural effusion has decreased . There exist now a loculated pneumothorax on the left base at the site of the tube entrance but otherwise the lung remains aerated with no extension of the pneumothorax in the apical area . The previously described left - sided PICC line remains in unchanged position .
    OUTPUT:
    
Successful exchange to large caliber chest tube with loculated small left basal pneumothorax but no other complications .