Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval placement of a right basilar pigtail catheter with substantial decrease in size of left pleural effusion , which is now small in size . Aeration at the left lung base has improved . There is small loculated basilar hydropneumothorax . The known multiple left - sided rib fractures are re-demonstrated . The right lung is clear . The heart and mediastinum are within normal limits despite the projection .
    OUTPUT:
    
Status post left pigtail catheter placement with substantial interval decrease in size of left pleural effusion , which is now small . Small loculated hydropneumothorax at the left lung base . Multiple left rib fractures re-demonstrated .