Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since ___ , substantial pulmonary edema is mildly improved . Bilateral pleural effusions , moderate on the right and small to moderate on the left , persist . Moderate bibasilar atelectasis is increased with continued low lung volumes . The heart size is difficult to assess as it is obscured by effusions and volume loss . The pacemaker positioning is unchanged . No pneumothorax .
    OUTPUT:
    
Mild improvement of substantial pulmonary edema with persistence of bilateral pleural effusions and compressive atelectasis since ___ .