Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest views were obtained with patient in upright position . Analysis is performed in comparison with the next preceding similar chest examination obtained two and a half hours earlier . Sternotomy status post bypass surgery as before . No change in heart size . The amount of left - sided pleural effusion has decreased moderately , but still pleural effusion blunts the left lateral pleural sinus and major portion of the diaphragmatic contours . No pneumothorax can be identified in the apical area in this patient examined in upright position .
    OUTPUT:
    
Status post thoracocentesis on left side with decreasing size of pleural density but absence of any pneumothorax .