Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval decrease in size of large left pleural effusion . Status post thoracentesis . No pneumothorax is identified . The right hemi thorax remains grossly clear , and there is persistent obscuration of the left hemidiaphragm and left heart border , likely due to atelectasis and some remaining pleural effusion .
    OUTPUT:
    
Interval decrease in size in left pleural effusion following thoracentesis . No evidence of pneumothorax .