Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to chest x-ray from the same date , interval drainage of left - sided pleural effusion . Mild pulmonary edema with moderate cardiomegaly . Mild retrocardiac atelectasis has improved . Multiple surgical clips in the left chest wall . No pneumothorax .
    OUTPUT:
    
Successful drainage of left pleural effusion . No pneumothorax . Mild to moderate pulmonary edema .