Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright and lateral chest radiographs were obtained . Mild to moderate pulmonary edema and small bilateral pleural effusions have improved over the past week . Retrocardiac opacity is likely left lower lobe atelectasis . Cardiac size is mildly enlarged but stable . There is no pneumothorax .
    OUTPUT:
    
Mild to moderate pulmonary edema and small bilateral pleural effusions , improved over the past week . Likely left lower lobe atelectasis .