Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the prior study , there has been interval placement of a right - sided pigtail catheter , projecting in the region of the right hemidiaphragm . There is a small adjacent right basilar pneumothorax , which may be loculated , given that this is an upright view . The previous right effusion has significantly decreased in size , with residual atelectasis in the right lung base . The heart remains moderate to severely enlarged . No new focal consolidation .
    OUTPUT:
    
Small , possibly loculated , right basilar pneumothorax after right chest tube insertion . Significant interval decrease in the size of the right pleural effusion .