Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Multiple sternal wires and mediastinal clips denote prior cardiac surgery . An upper abdominal endovascular stent graft is incompletely seen within the upper abdomen . The heart is mildly enlarged . Since ___ , there has been marked improvement of bilateral pleural effusions , with trace amount of fluid remaining . Moderate left basilar atelectasis has improved . The central pulmonary vessels are engorged , but there is no overt edema . There is no pneumothorax .
    OUTPUT:
    
1 . Interval decrease in size of bilateral pleural effusions . Trace effusions remain . 2 . Moderate left basilar atelectasis , slightly improved .