Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a pigtail catheter seen at the right lung base , which appears unchanged in comparison to the prior chest radiograph . Low lung volumes . There is bibasilar patchy opacification , right worse than left have slightly improved . There is an unchanged small right pneumothorax and small right pleural effusion . Interval decrease in left pleural effusion . . Heart size is stable . The mediastinal and hilar contours are stable .
    OUTPUT:
    
Improving bibasilar opacities and decreased left pleural effusion . .