Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Semi-upright portable radiograph of the chest demonstrates persistent left pleural effusion and no significant change in degree of pulmonary edema since the prior study . The left internal jugular central venous catheter and tracheostomy tube are unchanged in position since the prior study . The heart size is stable .
    OUTPUT:
    
No significant change since the prior study .