Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A right - sided PICC and left - sided chest tube are unchanged in position compared to the prior study . No pneumothorax seen . There is a persistent left pleural effusion , similar to slightly increased in size when compared to the prior study . Prominence of the pulmonary vasculature consistent with mild congestive heart failure . No frank pulmonary edema .
    OUTPUT:
    
Possible slight increase in the left pleural effusion , otherwise no significant interval change . No pneumothorax seen .